What I think is definitely true, is most people with boosted stuff don’t test em NA so they rarely have any idea the true VE of the combination or where peaks occur. So to make a statement that 30 degrees is too much for xx boost or xx compression is inherently false because you have no comparator. If an engine wants 30 degrees on 10 psi but you didn’t run it NA to see that it wanted 42 degrees NA then the 30 means nothing. It’s just a number. I’ve never, ever seen an engine take the same timing on boost that it did NA. That tells me that cylinder pressure absolutely has an effect on timing requirements. I haven’t experienced everything but what I have experienced tells me that true.