Anyone know where I could get some totally stock functioning xb seats ( with just a lever to quickly adjust flat to 90 degs) but with more support when your taking turns fast?

 

You already have them installed! They just weren't installed properly. They need to have a certain amount of spacers added at the front mount. This will bring the front part of the seat up to support the lower thigh. Mine needed about a half inch along with slightly longer bolts. Try it first before you go and buy new seats.