Hope dies last !!
No reason not to leave them in until they either go bad (you will know) or hatch !
I wonder, though, why did it take so long for the temp to go up with the heat source plugged in directly to the power? Mine went up rather quickly. But my incubator isn't really big.
Also, are the eggs buried in substrate or just laying on the tub floor? I can't tell. It almost like they lost some humidity, but the reading shows high humidity...
Either way, you have nothing to loose by letting them incubate for now.