jms90 wrote:
Do any of you guys have any suggestions on what might help?
About 10 years ago, I decided that the liners in almost all running shorts were junk. They chafed the thighs, caused my junk to move around, or caused a similar problem to yours. The liner was also the first part of the shorts to wear out and I'd have to toss an otherwise serviceable pair of running shorts. I found a very easy solution.
I cut out the liner of all my running shorts and wear a performance sports brief under the shorts instead. In summer, I wear Asics briefs under my running shorts. I've tried other brands, but I keep coming back to Asics.
In winter, I wear performance "boxer briefs" by Puma, Under Armour, RBX, and Adidas that I bought on discount at TJ Maxx. These are a little longer and warmer than the Asics briefs. My favorites are the Pumas, but the RBX and Under Armour are okay. They're made from a wicking fabric so they don't get wet and then cold in the winter. The Adidas tend to get a little too sweaty, so I wouldn't recommend them unless you can't find the other brands.
Once you find the proper fit, you don't have to worry about the fit of the liner.