The general concensus is that too frequent of feedings produce fatty deposits around the liver of the snake and reduce life expectancy. The sources Ive asked that breed Burms seem to be inconsistent with feeding info however.
Weekly feedings seem to be the most common interval at hatchling stage. If you recieved a new hatchling that was underfed by the breeder for maintenance purposes they recommend feeding every five days for a short amount of time to get some weight going.
My feeding plans:
Once a week until I hit large rat stage.
Large rats once every two weeks until I hit rabbit stage.
Rabbits 3 weeks.
..the breeders I run into that feed rabbits weekly all have MONSTER sized Burms (you're talking some with 130lb males within a few years). The healthiest animals Ive seen are fed rabbits once every three weeks....healthy builds, not overfed.
You've already got a Burm, and you know it's going to be a big snake regardless. Why try to rush the process? Ya know?
That's just my $0.02