has anyone mucked around with weight tubes to increase FOC? using for example- a few inches of the 8gr/" up front then something lighter on the rear. i'm toying with this idea for a new bow that i'm yet to receive. to get the weight and FOC that i want this seems like a good option, depending on how it tunes.

Have you thought about trying brass inserts or heavier steel adaptors?

yeah, i'm using 125gr b/head adapters at the moment. i was going to try those brass inserts as well.

they are hard to keep foward--and if they move at all they'll really mess w/ your arrow's balance--not to mention blow your nocks off

what i mean is use a few inches of heavy stuff up front then fill the remainder of the arrow with the lighter stuff. that way nothing can move.

Mate, even with Araldyte, and crimped at intervals along their length, the tubes blow nocks out from time to time.

Just go with some 100 grain brass inserts clint they work a treat.