baby bosc not growing need help

[fuzzhc]

pll Hi there im new to this form as it was recommended to me earlier. I have had a baby bosc for 2-3 months now, he was 11" when I got him and is still exactly the same size. He is only eating around 6-8 crickets a day and occasionally a few wax worms.
His tank size is 4x2x2 ( I know its too small but shall be getting a bigger one after Christmas) hot side air temp is usually between 108 and 120f, cooler, end is around 90-99f, basking last I checked was sitti bf at 147f the other day although I have seem to misplaced the temp gun and humidity is 60% day and upto 75 at night. The substrate for now is I know not deep enough but ranges from a couple of inches at the basking to around 8 inches at the cooler end.