Robert, on our '08 Dynasty that we just sold in November, I recall the green light on the inverter always blinked just like you stated above. I'm sure an electronic guru will pop in here to inform you if everything is normal. The 15.0+ charge does sound high but then again, I don't recall what our charging rate was while bulk charging.
I also would think that under bulk charging that the rate would be higher as you said under float charging it's 13.9. I'll be watching this thread as I would also like to know the answer if what you are experiencing is normal.
Good luck,
MM.