First off what part of the lane are you playing?
Secondly I am also a tweener only I am slow/med speed.
I bowl on a 44' pattern and I really struggled with it at first cause I had no room at all for error in speed or line playing the track area which was my small comfort zone at the time. So I got the owner to let me practice on a fresh shot a couple of times to try and find something that gave me a bit more room. What I found was that I could either go straight up the 5 with minimal axis rotation (20-30°) and a bit firmer on my speed or play 12 to 5 with normal or slightly less speed and 30-40° of axis rotation. When I first started playing the small swing it made me a bit nervous because it always looked like I was going to miss the break point.
As far as carrydown I always just select a ball and line that allows my to get outside and go around it.
Drilling I would need some details on how your current line up is drilled, what part of the lane you are playing and what part you want to play.
A couple of other things that may help would be;
Lower the ball in your stance (to reduce speed)
Move you target closer to the foul line (helps get the ball to roll sooner)
Adjust the position of your fingers (see "finger dancing" at bowl4fun.com)
Try moving closer to the foul line about a half a step this might cause you to take smaller steps and reduce you speed a touch (this doesn't work for everyone).
If you loft the ball a bit, try increasing knee bend to reduce loft and increase leverage.
These are things that have helped some of my friends that I have been working with, they didn't all work for everybody.
Keep at it, once you get comfortable with longer patterns you will feel like you have all the room in the world on the typical 38' pattern.
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