You did something wrong. No 6.5 midbass is going to play nicely up to 10k nevermind a tweeter starting there. That tweeter will likely play fine down to 3000 at a good volume. A 6.5 starts beaming at like 2700hz. I would start at 4k playing at the volume you like lowering the crossover point by 100 until it sounds like crap. Start at 2000 with the 6.5 and go up. Hopefully they meet.

I almost always end up with LR 24 db crossovers. 18 for sub to mid bass sometimes. I mess with them but that almost always sounds best to me in 3 way setups.