it really helps to have a band saw with some ballz.
I use a 3/4" blade (4 tpi) and have been having excellent results re-sawing everything I put through it:
hard maple, wenge bubinga, figured walnut...etc....
BUT... it wasn't always happy like it is now.
I couldn't manage a resaw to save my butt... THEN, I replaced all the guide wheels (bearings), and made sure they were aligning the blade properly, tightened the blade, squared & aligned the table/fence to the blade.... you'd be surprised how little a mis-alignment can completely trash your ability to cut straight resawing