If you've been riding your bike regularly for 5 years, you might be about time for a new one anyway -- mentally
But that said, -- I had a previous generation Santa Cruz SL w/ Fox RP32 rear shock? (I think )
I always thought the bike could benefit greatly from a newer CTD type shock - and the CTD technology may have been superceded by now, IDK -- but the CTD shock on my new bike allows me more control over my suspension settings . I set the ideal sag in the full soft setting as that is likely where I will be if I am hitting downhill stuff,
A CTD shock may not be able to get the brake jack tendencies under control though, and that is a function of design --- under braking , the suspension tends to "stand up" a bit and doesn't work as efficiently on a single pivot design like the Superlight
The dropper post can make a big difference too
That said , you may not want to spend $800 on a different shock and dropper post when that cash would probably go a long way towards a new Tall Boy, who knows