Board Thread:Questions and Answers/@comment-169.152.251.99-20121220211630/@comment-24.18.8.160-20121228054028

I don't see why it's limiting you to about 6 or 7...it should be 64 even if there's a limit of 1 packet/tick.

Try letting them charge up for a bit, THEN send them a redstone signal, and see how many out of 64 continue running.