Water heater issues

I found this forum on searching for help with my Dometic WH-6GEA water heater (installed in a new 2021 2108TB Winnebago trailer, purchased FEb. 2021 and used a few times since). First I'll confirm that replacing that thermal fuse was also necessary here to get my unit going again. I had spares on hand due to warnings on another forum about this general issue on Dometic water heaters (not specific to this model). I also replaced the circuit board with a USA-made "Dinosaur Board" Model UIB64 as that was recommended as point of failure by folks on another (Facebook) forum. My issue is that when running on propane the burner will go off and on before the water is heated, at irregular intervals. Sometimes burns for 30 sec. then off, sometimes for a few minutes then off. Then it'll kick on again after a short period. Or I can start it again by clicking it off/on. Very sporadic. This has happened at various elevations from 5000 feet down to 1000 feet (I don't think that is a factor) at air temps in the 60s. Meanwhile when burning, the flame ebbs and flows (or the noise does anyway) sometimes "roaring" which is when I believe the thermal fuse may have finally been melted at one point. When you open the access door to observe the flame you cause the flame to roar more so you're not really seeing the status when the door is closed except by sound. It worked fine at checkout with the RV dealer (of course). I live far from the dealer and will be doing repairs myself. It almost seems like it's getting too much air but there is no "air shutter" adjustment as I saw in some YouTube videos for this model. It's apparently too new a model to have accumulated much information and fixes from users. The manual is not much help. The only thing I have not troubleshot so far is the gas pressure at the water heater. But my stove burners and fridge work perfectly on gas. Thanks for any suggestions. In order to possibly help someone else, I'll attempt post photos of the thermal fuse and its location, of the original factory board as I unplugged it (pretty easy to do), of the installed Dinosaur board (I had to modify the cover to route wires, cut a hole in bottom of the cover with knife or clippers if your heater is configured like mine) and what my burner looks like in operation (with door open of course). Seems like it has a lot of orange in the flame, but again, this is with door open. Edit: I couldn't post photos within the forum but here's a link to my website page with the photos I mentioned.***Link Removed***
Edit again: I'm sorry I couldn't figure out how to share photos here. Upload did not work, and my link was removed as soon as I posted it. Possibly because I'm a new member. Hope the info is helpful to someone anyway.
(And editing again, 6/15/21:) I went camping for 2 days and the water heater worked fine on gas (using 12V power only in the camper), it burned through 2 heating cycles without an issue. I'm thinking it's a bad connection somewhere but I haven't found anything obvious. At least 4-5 other people with the same water heater on a Facebook Winnebago forum (Winnebago Micro Minnie forum) are also reporting similar issues...