Sorry I took so long to get back to this...
I buy a lot of geberic number and letter sheets from the Model Railroad section at the LHS... Keeps the Rivet Counters at bay, ya know...
I also use plain white vinegar as a setting solution rather than any commercial brands... So far, there're few decals I've had that don't settle down using it... So overall, if the decals will settle down into the recessed areas, thick or not, they're ok for me... If they need a little "Fingernail setting" into a recessed area after they're dry, it's no big deal, either..