With all due respect, I know I'm not the most versed in setting up the wave and no one should prolly be listening to me anyways, but, I'll offer my 2 cents anyways. I hear many opinions on emptying ballasts to achieve desired list in boats that are equipped with surf tabs. Methinks that all your'e doing is reducing your overall displacement. You may create a wave shape that looks good but the volume of the wave will be less, its just plain physics. My mojo had a pretty looking wave when I bought it at 2500 lbs ballast factory, as a newbie I did not know better, quickly I found out that there truly is no replacement for …..you know.
Bottom line, consider not emptying ballast, fill everything at 100% and displace as much friggin' water as you physically can and then use your tabs to create list and the surf plate and speed to adjust the amplitude of the wave. Don't sell yourself short, get the biggest wave you can get and then shape it, that what these tabs and plates are for.