Leaning towards 19inches as my compromise.
Suppressor ordered this morning and should be here mid-next week.
Then off to gunsmith for barrel and bolt fluting and fitting of the suppressor.
So far I have only been using ADI powders (mainly 2208 which I believe is Varget equiv) but if I can get some of the other suggested powders I will give them a try.
Thank you all for your input.