I've got a couple balls I had finger inserts put into, are vise ovals.  I have all my other equipment drilled without inserts, which I mostly like.  I do have a calouse on the right side of my middle finger which makes the nail kind of change shape and somewhat is painful.  Also bowling a lot, will make my fingers a little sore.  Not tons but since I bowl a lot, 10 or more games a day usually, sometimes it feels like inserts might be nicer.  The balls with inserts I got are kind of looser than I expected around my fingers.  They definitely don't fit too snugly around my fingers, can wiggle them a little in there and just doesn't feel completely right.  Is this normal, or should I get a smaller size, does it really matter or just a preference?  I'm still not 100% convinced to convert to inserts, but definitely don't want to redo all my balls with a size that is wrong and have to pay for more inserts a second time.  Also wondering the general thoughts on this type of issue, are my middle finger pitches possibly needing adjusting and it'll all be fine.  Or the inserts the best way to go and loose won't be a bad thing when I get used to it.  I can put my fingers in them past the first knuckle, also of course my fingers slightly change size depending on what I eat and the weather or how much I've bowled, so they can be close to snug sometimes.  If I push a shim of thin cardboard into the top of the insert, it fits more snug, is this a normal thing to do, possibly from them being standard sizes and me possibly needing just slightly smaller ones?

Thanks, really interested in everyones take on this, have seen a lot of stuff online talking about finger inserts vs. none but not much about the tightness of the inserts and if it is ok for them  to be rather loose.

I can't say whether you should stay without inserts or go with, but I feel your pain on odd sizes.  Usually I will wrap a piece of scotch tape around the insert before I put them in the ball.  This will make it just a little bit smaller and more snug.  It may take some experimenting to figure out if you need tape one time around or two or however many it takes.
--------------------
I am not a pro-bowler, but I do play one on BallReviews.com

Not sure if you're first trying inserts or you've had them for a while and have compressed them too much and have not repalced them. They do wear and do need replacing regularly.

If you're first trying them, like your thumb, the base size should be as large as your finger tips ever get. Fingers swell and shrink with weather, salt consumption, liquid consumption, increase and decrease in body weight and time of day.

Personally, I like my fingers to just fit into the hole. SO I glue them at the sides only and use shims, either plastic pieces or cut up business cards to go in the back of the hole between the back of the insert and the drilled hole.
The number and type of shim varies with the above factors.
(Plastic shims: http://www.milosports.com/Home_Page.html)
--------------------
"None are so blind as those who will not see."

They are brand new, only used the 2 balls with them a couple times so far.  Since they are two of my old urethane hammers, haven't used them a lot to test since conditions aren't usually optimal for them to hook at all (bowl mostly sport shots cause place I practice is a college alley and oil for the girls team with NCAA patterns).  So brand new, they are loose, I can put my fingers about a half inch past my first knuckle before they are feeling snug or tight at all.  Also always have wondered how different it changes things with inserts from the bridge having to be the same size so the fingers are spread out a bit more than without inserts.  Those are my two main concerns I guess, that having them tighter won't be a bad thing somehow over time and my driller purposefully picked loose ones, and the spread out fingers from the wider bridge is going to influence my game at all.  Also I have one set black and other white, sort of feel different, does the color really make a difference, white feeling slightly harder and black having more of a squishy feeling.  Or is it just me thinking it feels different, do others find them differ in feel like that?

If you think they're too loose, they are too loose, because the fit is a matter of personal preference.  I personally don't use grips, but like my holes drilled a little over sized for a loose fit.  All you really use is the front of the hole/grip anyway.  --  JohnP