This is really something new to me, I've learned a lot.
In my country when pacman starter get their first pacman, they always begin with a warning like this: over feeding will kill your frog, so only feed they twice a week when they are small, feed every week when they are sub-adult.
I'd try that 15mins rule.
I do have few more questions, how often should i feed a sub-adult? and wat about a adult pacman? Dose all the advance keepers in the US do this 15mins rule? Is it for pacman only or if it also fits other frog and toads?