Suburban not hot enough

I guess this will remain a mystery until we take the TT out again. I checked the WH bypass valves and they were in bypass position. Since I winterized by blowing out the lines and removing the WH drain I don't know why I would have placed the valves in that position. I'm hopeful that was the problem. I plan to buy a cleaing wand anyhow. Seems like a good idea. If I still have the problem, I'll probably look at the thermostats. I'm puzzled about the shower faucet discussion. We have never shut a shower off at the head rather than at the faucets. If I understand correctly that was a concern. Thanks again for all the responses.