A faster powder should give you less shot to shot variation but reality, unless you & your gun are capable of sub 2" groups at 25yds offhand, you aren't going to notice accuracy issues.
I used to shoot RedDot in the 45colt for light loads. it fills the case better than TightGroup but is position sensitive where TG is not supposed to be. Yes you can use Dacron over powder wad but a PITA IME.

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NRA Cert. Inst. IDPA CSO