If they are not expanding enough for you FF I would suggest you are driving them to fast mate.the only snag with interbonds is availability and cost. Ive shot a few deer with them (albeit not fallow) and they dont expand overly well.
If its long throated, i would go with VLDs, they are good bullets, mid priced and drop things well..
My long throated 7x57 Lothar Walther barrel won't shoot anything less than 154 grain projectiles. What bullet would you recommend I load for mature, well fed Fallow bucks ?