Hobbyking X Car 120a Esc With Losi 6.5t S Motor Issues

[Cremegg]

I Have recently got the hobbyking x car sensored esc (120a) and an losi xcerliron s 6.5t motor

the esc is a copy of the hobbywing xerun 2.1 and im using the hobbywing firmwares

I connected the new esc and connected the motor correctly and done all the calab with the tranny, it has boost and timing on the esc. If I run thee car in my hand and full throttle it gives full power....and if I run it on the ground while under load and give full throttle it doesnt give full power, ive tried a few firmwares and the only one that works is the "no timing" one, could it be the motor? The esc is fine

could timing and boost be causing the motor to no operate correctly or could then motor just not handle the timing thst the esc is giving out...I come to that conclusion cause its runs perfect in blinky mode

Any help would be great...thanks