Those Fury's sure look nice, but I question if they kill 'em that much deader to justify the $1+ a piece price... I suppose if you're pushing the envelope, sure, but for most muzzleloader hunters?
The FTX bullets really need a muzzle velocity of 1800+ fps to expand reliably, so I'm not surprised they tended to pencil...
The XTPs have expanded nicely in my experience. An exception would be using a lighter XTP over a "magnum" load, then over-expansion could be a concern. But if you stick to a standard XTP with "normal" charges, you won't have any issue. At $15/50, they're a bargain.
My personal preference is to go heavy, even if it's on the slower end of the spectrum. 300gr .430 XTP out of my Optima V2 chrono's an average of 1620 fps pushed by 100gr 777.
100% pass through rate on every deer taken (9 for 9 to date with it) All double-lung/heart shots, 60-150 yards. Blood trails Ray Charles could follow, but none made it more than 60', half didn't make it 15'. Never recovered a bullet, but exits were typically close to 1" in diameter.