So I am already grumpy and its only around 7 am. I have 3 OG GSC seeds waterboarding for two days now and the hulls are sealed up tighter than a frogs behind. These beans are from my Spanish friends at Dinafem and this is another reason to find a good discreet US supplier. They are sitting on my wifi modem at a perfect 79 degrees in a baggie wrapped in a moist paper towel. I am not the most experienced grower around, but slow poppers make slow growers I've been told.
Should I move on and abandon the frog eggs?
I suggest starting a new set of beans while continuing to coax the current ones out of their shells. I like temps pushing 90º for germination. I don't know the specific temp other than to describe it as slightly better than warm, like warm on the touch.
Another 'weird' practice I have when prepping my seed sandwich is that I drench the paper towels past saturation, then while hanging heavy and gushing water, pinch the perimeter to bleed off the extra water from the outer 1/4 while leaving the center completely drenched, then like bud drying, the wetness in the middle bleeds out to the dryer freshly pinched areas to even out the water pressure.
This I find to be a great way of regulating how damp I get my cloth and I find that better than warm and very moist to be the best starting environment. I've had plenty of plants start in 18 hours then put down roots to then grow super slow, lol. Do ensure then when folding the wettish towel over your seeds that you make effort to leave some air pockets in there.
Back in the early 90s when I was a curious teen, I used to germinate brick seeds by the 50s in a wash cloths and I think that was better. It held a lot more air, so I know air in there is important. Also, when sealing the ziplock, get it to pillow to hold air inside.
FYI, I use a heat mat, but then stack up layers of bath towel as the heat mat is far too hot. I bet if you use 2 teacup saucers like a clam shell on your router, you might be able to get it just the right amount warmer than 79 w/o over doing it?