The thread name kinda scared me for a second lol.

But i think frank hit it on the head, from what you say your feeding him, i assume its still young (right?). Monitors grow at an amazing rate and are always hungry. If you show me an overweight baby/juvie monitor, I'll eat my hat Feed him a lot and keep the basking spot hot! I recorded my savanna's growth rate when we first got him, he was averaging growth of an inch or two every 2 weeks! I had a 2 foot, defensive beast (I was truthfully terrified of him, i had never dealt with any animal like a monitor before, so I rarely worked with him lol) in no time at all! Lol, but good luck with him man!
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Jason