If you can't open more SkySaver seats, you can't. So, by default you have to fiddle with the other side of the equation. I'm concerned that credit card users are getting seats and loyal DL flyers are not. Are you really making sufficient money from the CC operation that you want to risk aggravating the people who fly Delta? I mean, you're an airline. Right? Maybe you should be reselling One Pass miles instead. Then everybody wins (except CO flyers).
Suggestions:
Maybe the 500 minimum is too high. Maybe DL Connection miles could be reduced. Maybe there should be a revenue factor like with the old 50/100/150 percentages. Maybe you could do any of tehse without affecting MQM calculations.
I'm a PM tis year and I haven't found the availability I thought I would (admittedly the lazy way - online). If I fall back to GM or FO, I may end up frustrated and looking for a status comp elsewhere just to see if the grass is greener. And I think that's the opposite of what DL would hope for. Please tell me you want to keep all your Medallions.