changing the dismemberment values in any fashion (unless making them higher) is generally considered cheating when making a ukebash replay, you can play the game how you want tho
the issue you're probably facing is that you aren't very used to the concept of ghosting yet (when you clip inside of the joints at the moment of impact to make them "explode") and are just doing strikes you would do in a tricking or sparring replay, and its very uncommon you will be able to get many dismemberments with pure force alone
boomhits are actually pretty much an exploit, theres plenty guides on this forum to help you understand it because its a pretty weird thing to grasp