MaddMaxx0121

I think you are good as far as your 80% comp as that is for a good period of service, etc.  My only concern would be for VA healthcare now and in the future.
I am 80% with an Honorable Discharge and can get free care through the VA system for anything, except dental.
You, however, may not from what I read.  You need to call someone at the VA and get a good answer.
For other things, your last discharge may be the only one that counts.  So there is that.
As far as the double dipping, what would have happened, is you would have drilled for free as your comp was probably higher than your drill pay.  They deduct your comp pay from your drill pay, but do it at either the start of the year or the end of the year.  Not sure.  But, your comp is tax free so that is payed first.
What you should have done was to have kept drilling and to ask for a medical discharge from the reserves.  You already had the evidence because of your VA disabilities.
If I were you, I would contact your reserve unit's higher headquarters or better yet, your State HQ and beg to get this fixed.  Your unit might be pissed at you, but thier HQ and your State HQ don't like bad discharges.  It reflects badly on your State.  In the reserves, its a competition between States.
Just sayin,
Hamslice