I see your thread got moved. Sorry you couldn't get the help or info you were hoping to get. Hopefully posting in your Wildwood forum doesn't ruffle feathers over here...
I'm not sure what waterpumps get put on the Wildwoods, but I believe I read somewhere that the Girard needs like 45psi minimum to operate. If you did do that you would most likely want to set the switch from Auto to Low as the low puts out a lower btu flame to compensate for the slower flow. If I keep my tankless I will most likely install a higher flow higher pressure water pump.
Also, do you have a water filter in your system? The more restrictions to water flow will give you higher water temps. I have seen numerous boost pumps that work with city water to boost the pressure and volume. This may help with the scaulding hot water issue...again if I keep ours I may look into those as well.
What combos have you tried with regards to switch position and turns of the faucet in the shower? I found at one campground Low and half turn of the hot faucet gave good water. Another one, High and full open on the faucet gave good results. My wife and I have been burned several times by this thing and each time I threaten to rip it out. We had a difficult time getting good temps when using our fresh water and ended up running out of water at the end of our weekend stay. You shouldn't have to play with these things to try and get the right temp. Military showers are even worse and you end up wasting more water trying to get the temp back set again then if you just let the darn water run.
I understand your frustrations, know that you really are not alone, many of us Wildcat owners are not happy with these...they are just too inconsistant. However, some have been very happy with theirs. Thankfully now it is not a forced option, but so far no offers have been made to replace these with a regular style water heater for those of us unsatisfied.