I would up the potash to 300 or 400. Depending on cash flow. 

The mg level is fine.
The cal is high and gypsum just made it worse by add 800+ pounds of calcium. 
Build the K level to 4% and use ams.  Over time the cal will get better.  The biggest issue is spending the fert $ correctly and not throwing $ away.  

Guys use gypsum to lower mag levels that are 20-30+%, add cal, sulfur, and loosen compaction.  
at 10% OM you can not have a compaction issue. 

This is the issue with throwing around the idea that everyone should use gypsum and how great it is.  Not on soils with 77% cal.  Too much of a good thing.  .