There are ways to use pistons you have and sort of 'trick physics' to get them to extend faster. If you had two pistons that were somehow connected so that one side was facing one way and another side was facing the other, you could get the pistons to extend or retract at the same time and therefore theoretically get twice the retraction or extension speed from two pistons than from one. It was an idea I got from 1986 last year and our team probably won't be doing this, but I would love to see a prototype of this
