I simply can't get it to work. I tried including pawn eval and king safety in it, which would make it much for accurate (in exchange of plenty of speed obviously), but no go again.
Perhaps the more accurate lazy eval makes it have so little speedup that the few times it actually misses something are enough to make it fail in total.
Some people suggest that the futility pruning already does a big part of lazy eval, which of course makes sense. It's also a check on inability of reaching alpha, even if you were given a piece, but with a full eval and then cutting big chunks out of the search tree.
So maybe they're stepping on each other toes, and if I'd have to choose between the two, futility pruning has a lot more potential.
I'm leaving it for now, will revisit when I start my evaluation revamp though.