Hey @mervo ! Thanks for sharing your story. You're not the first person that recommends upgrading to Gold Lions. I just looked for them and it seems it's out of stock everywhere.
I enjoyed my MA252 for about a year before I had the opportunity to upgrade my 683s to the 702 Signatures. Then I found out just how power hungry these speakers are. After some research, I upgraded to a MA352, and boy they make the 702s sing... Then I got a REL S5/SHO (deal was too good to pass). So now I am on "just enjoy the music" mode and trying to control my G.A.S.
BTW are you using the sub output or the high-level cable from REL?