somthing I have found in the past is the prob with some snare drums is the snares themselves. If they are not fitted up just right they can be almost impossible to tune.
Make sure that they are on there just right.
I used to have one of the old pearl school drums you know the snare with the stand and case, but it was an all metal shell and no one could ever get that thing to sound good ever, I ended up putting a falam II on the top and made it have that high pitch sound to it and it was really cool
