Granted there could be a toe in/alignment problem BUT he pretty much summed it up when he said "It seamed that I was always over steering". At least I did not use "the nut behind the wheel" that I've been know to post.
I have helped several friends transition from pulling a trailer with a PU to a MH. I go for a ride with them and all three have started their turns too soon (sitting in front of the axle takes some getting used too) and they have fought the steering wheel... over steering it. By kneeling besides them and and stopping them from turning the steering wheel too much plus having them look 200-300' out front they get the hang of it fairly quickly.
Sometimes on a windy day I have to make myself stop fighting it as it's easy to start over steering it. I'm amazed how nice my MH handles... even when passing 18 wheelers on a windy day and it's a 04 with 70K miles. I've been tempted to have the DW that a video of how little movement it really takes to keep it straight... less than 1/4" and yes a tag axle coach helps too.