Maybe your friend was super-attentive due to the assignment, and what he observed in the front would not normally be noticed or concerning? I agree with those who say wait till you can drive it and see for yourself. It sounds like it is much improved.
As to tires, you can affect handling by playing with the pressures. Generally, if the front end feels too quick, you can help it with more rear pressure, or less front pressure. But, you don't want a pressure so low that the tires can't carry the load, and of course you don't want to exceed the upper limit either.
If you google RV tire pressure chart, you should come up with the industry standard chart showing the load each tire can carry at a given psi. So if you know your front axle weight is 3000 pounds, you can find the lowest psi for your front tires. Same for rear. Actually to do it right you need the weight at each of the four corners, but lacking that you'll have to use common sense and not go right to the lower limits. What I'm saying is that you could end up with say 80 rear and 50 front, or something like that, to make it handle properly.
edit: here is goodyear's chart:
http://www.goodyearrvtires.com/pdfs/rv_inflation.pdf
