Plumbing questions? Ask a plumber and get answers ASAP.
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What is the drain piping material? Have you tried a #10 (extra thick) wax ring?
So you're using plastic spacers to build up the height of the flange? Did you clean the flange and seal between the spacers?
If the wet spot is coming from under the bowl not running down the sides of the bowl, you haven't given me any indication of a problem with the install. The seal between the spacers is critical. Maybe give this toilet seal a tryhttps://www.homedepot.com/p/Fluidmaster-Better-Than-Wax-Universal-Wax-Free-Toilet-Seal-7530P24/205762183?MERCH=REC-_-searchViewed-_-NA-_-205762183-_-N
Technically the top of the flange should be 1/4" to 3/8" above the top of the floor. If you have tried the Fluidmaster seal I linked above give that a try.
If you have 3 spacers I suspect the leak is coming from between the spacers. The must be well sealed or they can leak. Beyond that, I don't have anything else from here.
Using spacers is always the better way to go but the must be sealed properly between the spacers. 2 wax rings is not something a plumber (at least decent one) would do.
I use an adhesive caulk like Phenoseal. Be sure you get all the old wax off the flange. Use lacquer thinner or PVC primer/cleaner to be sure. 1/2" is a bit too high.
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