I'm not sure what you meant by 'is feeding an issue'?
If it means, will they not eat if uspet? Then the answer is yes. (This is true of all monitors, really, just a matter of what degree).
The first question you asked was most important. How long did it take to acclimate? (to me? to captivity?)
The female I have was imported as a baby, and raised in captivity(but not by me). She is way more comfortable with my presence than the male, and will make physical contact with me if she has a reason to. (An example; I was trying to get her to grab a loose mouse in my kitchen for me, we were both laying on the floor. It was cold, so she climbed up on my back, and flattened out her belly on me, to absorb the heat. I fell asleep like that, since I didn't want to shake her off.)
The male that is pictured above was caught and imported as an adult. He is still adjusting, three years later. He would step on me if I were in the way, but if I made eye contact, no. I'd get a huge threat display. I know he likes me, in a fashion, but I doubt he could ever be trusted to the extent that I do the female. He can and has bitten me at his whim.
Of course, how much of that can be attributed to his being an alpha male animal, and the female, a young smallish female, who knows? I suspect their rankings amoungst themselves may have a part in how they treat me (auxillary colony member? albeit a funny looking one).
I don't really care 'why' anything is, I just accept them as they are and deal with it. They are changing as they age, too.
Animals don't follow general rules, as a general rule. hahahaha
But younger is better, less emotional baggage. Monitors are emotional lizards.
D.