What I do is either wear a belt when sizing up or when it's tight around thigh sit the waist lower. But the best idea will be to try them out in store. Sometimes you will find one that's perfect fit on both thigh and waist.
Congrats on the 73j aramis. The feeling of seeing and holding a 73j for the very first time is just indescribable.
Btw, I think the length is perfect. And if you want more stacking, just wear with high top or boots.