blocking the trem off will stabilize the bridge, but keep in mind you won't be able to use it.... this also doesn't 'fix' anything - it just prevents the bridge from moving to where it wants to go.
if you are not interested in using your trem, then using wood is fine. if you want your guitar to actually still have trem functionality you'll need to keep adjusting your bridge until you get it right. as previously stated, adding springs can help depending on how much of an angle you're off at - in my experience 9 gauges at standard tuning should straighten the bridge out with 3 springs - i use 10s on my guitars so i immediately go to 4 springs and i usually have no issues. 7 strings get 4 springs as well.
if you're in tune but the bridge's butt is sky high, detune the guitar slightly and start to tighten up those angle screws - keep rechecking tuning to make sure you dont pull the strings too sharp so you don't snap any strings. eventually you're either going to run out of adjustment screw or the bridge will straighten out at standard tuning. if you run out of screw, you need another spring back there.
if you want the best of both worlds with a blocked/floating trem situation, get your angle set right and then get yourself a tremol-no.
if you can, give us some pics. if you have any more questions, pm me or post back!