The problem will be the stress you create by trying to level it with wood and shims. I would use foam, as you should always put foam under your tank, as it allows compression and if the tank - stand is not great, the foam can compress in areas and then not in other spots lowering any stress points.
So I would try using the foam and if you have to shave off some to create a level service, and if it isn't perfect, then the foam can do its job and you hopefully won't crack the bottom when full of water.
Personally the gap at the bottom is too much for my liking and I would build or buy another stand.
I hope this makes sense.
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Setup: 180G DT, 105G Refuge (approx. 300lbs LR, 150lbs Aragonite)
Hardware: Super Reef Octopus SSS-3000, Tunze ATO, Mag 18 return, 2x MP40W, 2X Koralia 4's Wavemaker
Lighting: 5ft Hamilton Belize Sun (2x250W MH, 2X80W T5HO)
Type of Aquarium: mixed reef (SPS & LPS) with fish
Dosing: Mg, Ca, Alk
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