Ugh minor oil leak-picture attached

[Kristophe]

I previously had an annoying oil leak until I replaced my OFHG earlier this year and finally was able to enjoy a drip-free garage (as well as my parking spot @ work). In June I replaced my valve cover gasket after finding traces of fresh oil in two of the spark plug wells. Now I've encountered this new leak and I'm stumped where it could be coming from. I'm sure hoping it's not a bad main seal. The oil collects at one of the small bottom bolts where the tranny and engine join and oil even builds along a ridge and drips onto the sway bar. I've searched as much as possible without removing the the so-called stiffening plate. Any ideals?