heating problem, can someone help me?

I just built a melamine rack for my ball pythons (7 tubs high) and I installed 11" flexwatt up the back panel on the inside of course, currently my herpstat is set at 115 degrees and I cannot get the inside of the tub over 79-80 degrees, is there always this big of difference in temp vs setpoint? And is it safe to raise the temp on the flexwatt any higher? Any advice is much appreciated!

what is your room temp? did you double check to make sure your connections are nice and tight?

My room temp is 68 and I had the people that I bought the flexwatt from hook it up for me before they shipped it. I have the herpstat probe right on the flexwatt and it has no trouble getting to temp but the warm end of the tub just isn't getting warm enough.

Bringing the ambient room temp up should help. Reptile basics suggests back heat for 74 degree and up room temps and belly heat for temps below that.