I'm an older runner (50) and the balls of my feet tend to take a hammering in the longer road races. I have been wearing Nike Frees (the most minimal ones) for years and love them but they're not exactly well cushioned. I recently bought some Zoom Flys in the hope that, being a bit more built up, they'd give me calves and feet an easier time. They had their first serious outing today at The Big Half and damn if they weren't even harder on my feet than the Frees! (Calves like them, though). So I'm wondering if some sort of gel insole would help. I am not looking for anything with support - just a bit of cushioning so I don't feel like I've been walking around in stilletos all day. Any recommendations?