The wood in the 1527 is not inferior to the UV. Even though they are both basswood, no 2 guitars will sound exactly the same (I had 2 UVMC that sounded quite different, even though it was the exact same guitar).
Changing the pups in the 1527 will definately improve its tone. I would try something different to the blaze. A couple of
Seymour Duncan (I had them in a UV777PBK I owned, but I cant remember which pups I had, I beliebe they were a JB and a 59, but I cant tell for sure; what I can tell you is that they sounded much better than the Blaze).