Ok, lets keep in mind I've never even really looked at a hot water heater before this
I got it going. I re-pulled it all apart and looked a lot closer through the tubes, etc. The tube to the right of the flame adjustment slider had some cob webs in it. Blowing through it as I originally tried did nothing to move them of course. This time I ran water through the tube and I could see much more light when looking through it. Reassembled and boom! Works perfect.
I'll justify the $85 by saying it would have cost that in diag and repair at a camper shop and I learned something new.
Thanks again for all your help Sundancer87