Despite your domestic considerations you should know the rooms standing wave bass mode locations by conducting the subwoofer crawl using your SB3000. The loudest modes are where your subwoofers should be or fairly close to. Using DSP to remedy a room null subwoofer placement is a stretch at best.
Assuming your beautiful Amator's are -3dB at their rated 35Hz your T/9i will have already begun its roll off to meet its manufacturers rating of -6dB @ 27Hz. Richard E. Lord termed his REL's sub-bass speakers. Little has changed since.
Both the F113 and the SVS are manufacture rated -3dB @ 18Hz. This lower response can embellish exactly what your seeking. I'm guessing despite their similar specs their overall presentation will differ but can be used together.
I had a JL Audio F113 A.R.O. (v1) for a short time. When I used the early Velodyne DD's twenty minute Auto EQ to Optimize that early F113, it responded startlingly well and gave up little if anything to the big 18" Velodyne. Point being while JL Audio's automatic only frequency leveling DSP works very well it's somewhat limiting. The CR-1 creates an all important detailed crossover region at a price.
A few of the more important Optimization parameters Velodyne used in their DD and DD Plus series SVS has included in their current application. I would suggest seeing if the SVS can master control the Fathom. Hoping your domestic and technical goals can come together.
