What are you currently throwing? Hard to give suggestions without info.

If I had to name some popular balls that I know are smooth:
Brunswick:
Melee, Meanstreak Brawler and Beatdown,
DV8:
Dude, Diva, Maurauder Madness, All the Nightmares,
Storm:
!Q Tour Solid, Marvel-S, Reign Of Power
Rotogrip:
Berserk, Disturbed, Deranged, Rumble

You have it. The revolver is very strong and smooth with its 4000 siair finish.  Ball corners perfectly and  has great carry. I use it  on all but the burn. Drill it up and be amazed. Im on my second one and still loving it.

My crossroad (especially with the shine knocked off) is my smoothest reacting ball by far...

I have a Strike King drilled weak and 4000 surface with no polish, it still has plenty of punch. Playing 25 or 30 on the lanes there is no quit in this ball. I do not have a lot of hand.     

Hmmm,

My strike king is 5 1/4 by 5 1/4 and is quite rounded with a good punch box surface.

I am rev dominant with some of the sharpest backends seen by most people, but not by this ball.  I feel a 4 inch pin to pap for me on this ball would be a right turn!

REgards,

Luckylefty

IQ solid is one of the smoothest balls out.  Also, for me most balls will smooth out a bit if I use an axis hole, especially if combined with a pin down layout. 

Good point on end over end roll.  Too much axis rotation makes for an abrupt move off the end of the oil, or hitting the outside dry boards.  Different layouts or surface preps don't do much to minimize it.  If you watch the pros who are doing the best these days, they have all cut their axis rotation down a lot, even if they are still high rev players.