I tried the same thing, don't use RP2 Tubes. They just don't play well with Peat Engines for some reason, and probably a lot of other blocks. (For instance, a lot of blocks which "auto-output" to Pipes won't "auto-output" to tubes.) I know the Diamond Pipe system necessary is a pain to set up. Or maybe you can use GT Electric Translocators for Peat transfer. Then again, you probably aren't playing a pack with GT, so just set up a Diamond Pipe system which is a pain to set up.