And, case is solved. Just needed a good old fashioned block SA access in ROM, upload ldr, upload dir, backup resources, slow responding fix, unblock SA access in ROM, and power cycle.
All done with no supported family in my outdated PC-3000 software.
I wonder if this is going to be a trend with these new 5 platter models. Seems an awfully new drive to be having a slow responding bug already. I'ver only found one spot with a couple bad sectors so far.