First of all, the flush, as you know, is a measure of how well protected you are.
I also understand, that if you take niacin daily, the flush threshold rises. Basically the more you take on a regular basis, the more you need to produce the flush (and therefore be protected).
The other day I was horny and impatient, and "went ahead" before I had taken enough to have a good flush. I had "traces of a flush". Day 1 was decent, day 2 a little harder, but now day 3 I'm OK (maybe just a little tired). But if I have a good flush, I barely suffer day 1 and THAT's IT.
So I think it's more important to have one or two good ones a week, and be glad that you can, than have one or more a day and suffer. It's sort of an uphill situation, because the niacin can't do it's work as well with more.