The Dive Buddy weight calculator was dead on for me! So I’m giving it a thumbs up and a great place to at least get a ballpark number to start with, then get in and do a boyancy check to fine tune number!
PS: if that other forum that gave you grief was scuba board, that’s pretty typical for that group, that’s the number one forum for pontificating and brow beating, hey, they know more than you do no matter what the topic and they love telling you why!