I'm a ski race parent. I tune every couple of days on snow. My U12 boy skis on 0.5 degrees base bevel, three degrees side edge. Here he is on a firm course at his last race this year: https://youtu.be/RWYO2ib-qe8?si=CRH01ViFUFApSx_o Setting that up is difficult but it's pretty easy to maintain once it is there. Side cut.com has great advice and tools. If you are on groomers and ski on decent skis, not powder boards,…
Son is U16, same 87/0.5 and if I am not doing them well, he will tell me as he can feel the difference. Of course, we have race and training skis, this helps having the race skis very well tuned. Your son is good :-)
U16 is quite a step up, the courses get quite challenging at that level.