I have the strictly opposite advice to recommend. Ditch the cushioning completely. I had stress injuries every year until swapping to barefoot shoes, and have experienced none since. It changed my gait and allowed my stabiliser muscles to actually function. Could not recommend it enough.

Were you experiencing knee pain? It could be possible you were at a level were your tissues were adapted enough to able to accept that additional straing. And I would stress that works for you probably won't for others - as a few counter examples, Mr Sorokin was wearing shoes with cushions during his run, and other elite runners who grew up running shoe-less, such as Haile Gebreselassie, run with shoes.