Tire problem I think.

[Surly LHT]

Schwalbe Marathon Plus Tires I just got these a few days ago as most here know. I like them a lot but this weekend I took off on a small road trip and for some reason they seem to make my bike to lope a little. Could it be that the tires are not center good on the rims. Should I let all the air out and try to move them a little then air them up again. These tires was hard to get on I thought I had them center good enough but maybe I don't. I know they have wire on the edge of the tire and they are a tight fit. Or could I have gotten a bad tire. I think it may be the way I install them. Going to try to remove them and reinstall them again this next weekend but wanted to run this by all here first. Any input on this matter will be a big help thanks.