I do have a BR management its my own but works well for me. I will only evr play for 5% of my roll. At the moment 5% of $500 is $25. As the roll gets lower I adjust down. Its higher than the management you suggest but I dont think its unreasonable.
Over the weekend I twice put $20 in a $5 rebuy, $16.50 twice in the 360 max, $65 in $6.50 \SNG. The rest went on $11 180 mans.
I think this is Ok what do you reckon?