If, you shoot much?? you will want a Sims recoil. as suggested by one of the fellows.
I fully agree DO NOT CUT the QLA until after you shoot. I get a 'satisfactory' 2" group at 100 yards and this with 100 gr RS & Hornady 240 XTP. 209 ignition.
Your choices seem to be OK and as I KNOW from experience, you will change one or more of the components of your weapon. I hope you enjoy your Omega as much as I enjoy mine.
a fellow at the range shoots an Encore, same load and gets just about the same grouping as I do. So, figure am doing OK.
One change I am making this year, next week, is to Black Mag 3 and Shockwaves. do not know the load, yet, but will post it as soon as the powder arrives and I have time to shoot enough to arrive at a satisfactory load. One thing I know, am moving the chrony back to 15', so as NOT to blow the darn thing up or burn it up.
No matter what powder I shoot, so far, I have a crud ring and this BM3 is NOT supposed to create such a ring. Time will tell.
also shoot a replica Hawkin, some, and this inline is much more FUNNER!
Cuz