Had the R's..........sealed and ported and my 2 10" w-250 spl Premier subs sound better and are louder than my R's ever were and I was running 12's........of course this is to the ear, so on the meter I don't know. I did 144.2 in my cavalier years ago with the R's off 1200rms and running a little more power now, so maybe that is why.......but they sound so more musical.
Also the R's took a huge ported box, to where my Premiers only are in a 1.1 cft box@35 and if I would guess, I am right at 144/145 dbs.
Using the same amp you have by the way.