Don't overthink ball choice.  As with any patterns, different balls work for different people. Bring a mix of equipment and figure it out in practice. Generally, you'll want your breakpoint to be close to the gutter. If you can reduce your axis rotation consistently, this is a good pattern to do it on.

if the lane topography or oiling machine provides some natural bounce off the 1-2 board, the pattern (and any short pattern, really) can play very easy. If there's natural hang on the 1-2 board, the pattern can be very very difficult.

2 more questions for Stockholm pattern:

1. So at 34 feet, where should my ball be on the lane?
2. At 34 feet, should my ball be in the hook phase or roll phase?

If it is a light volume; then a urethane ball would probably work best.  If the volume is heavier in the front part of the lane; then you would want to use something with a dull surface and uses energy earlier so it doesnt jack knife once it encounters friction.  Also; I found this on youtube.  Chris Barnes tells you how to attack the pattern.

https://www.youtube.com/watch?v=nmFfxa3V3bk