m8 dont get me wrong, but, buying 6 750ti to mine scrypt is like buying a mini cooper and going off road. Let the pool take its due, 5,5MH for 6 750ti seems low, my 660ti gets up to 2MHZ on latest CC miner alone, and I know for a fact that one 750ti can get better than that, while running cooler and not needing so much watt.
Were I you, I would definitely hit the cudaminer thread, you totally need to finetune your cards if u dont get more than 10MH.
TL:DR 750ti has the best MH/watt/investment ratio for x11, you need better settings
No offense taken, but I think your analogy is all off: It's like buying a monster truck and never taking it off road... or buying a race car and only driving it to starbucks.
Getting 10.5 Mhs now on the x11. If I'm using ccminer, would I still hit up the cudaminer thread to do some tuning?