I too use the 'flat table' set up method.

I have the most accurate digital incidence meter I have ever seen !
I don't use it.

I can set up with a pinpoint height gauge and then when I double check it with the
digital incidence meter I find that I am "dead on".

Having proven this over and over again I just use the height gauge now. Takes almost no time.

Like race cars I have found that most people have their own preference in aerobatic A/C set ups
and that it is NOT a 'one size fits all' phenomenon.

It still takes me about fifty actual flights to get it where I really like it.
After that I find virtually no difference for the rest of the year, in some cases multiple years.