1. 172w is quit alot and i doubt that the block couild take the 200W+ heat load without heating up quite alot. i would think that 100-120w would be nearer the limit.
2. insulation can be a pain but isnt too bad if you are logical.
3. afaik no shim needed
4. havent tried one but all the dden stuff ive had has been v good.
Si
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