Master - I will try that, as a last resort. (this second batch of beans has only been 4 days, today is day 5...so I will wait a little bit longer.)
OldSSSCGuy - They should be fairly new. It is a newer released strain of dinfem. And the beans are pretty decent, like fair size, some tiger stripe, nice deep brown. (sometimes you buy beans and they are tiny little white beans ... but even those usually work.)
GuyBrush - The only different thing I have done from before is, normally I put the beans (in the plates) in-between my pants with a thermometer, and heater pointing that way. This time I used heat mat, only different thing I think, but thought it might be better. The seedling tray the plates are on have little indents so it's not exactly sitting flat on the heat mat (and there is towel under to). But maybe it could still be to hot. I will see, maybe move back to my old way completely.
Pro Headies - Using Rockwool, which I find a tad bit more harder than soil. Once bean pops, then I put a hole in the cube (with a sanitized new drill bit), then put cracked been in there about 1/2" deep, then pinch the corner of rock wool - very small piece and cover the top so it is in dark, but not restricted to pop out. Then I put water misted zip-lock bag over, and let her air out once or twice a day for fresh air.
Once seedling has popped then I leave bag until she reaches near top of bag, like 1-2 day after she popped out. And leave in the seedling tray with cover to keep humidity 50+ for baby.