I would get the Paradigm signature sub(s).
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I auditioned Paradigm's at a local dealer and have to admit the Paradigm Signature Servo Sub is quite astonishing, albeit massive. Would be nice to know how it compares to the JL side by side. I notice JL keeps cropping up as THE sub to beat, but I haven't heard them. There is now a dealer in my area that I will soon be visiting.
The "blend better with my SIGS" issue is a matter of setup. So changing subs will not solve that problem. It's true the M&K will not play as cleanly loud or low as some subs on the market today.
Paradigm Sig Servo
JL Audio F113
Considering the cost, the SVS is an amazing value. It was reviewed in the last Stereophile.
To address the blending issue pay more attention to setup (level matching in particular), consider a Velodyne sub (say a DD-15), use a Velodyne SMS-1, or use an AV receiver with good room correction.