Originally Posted by Machka

let's keep in mind that you, yourself said .. "I've tried four different expensive saddles with cut-outs, but none were comfortable enough for long rides" ... hmmmm ... maybe a non-cutout saddle might might a better choice ... maybe a better bicycle fit might help ... maybe increased core strength and fitness would be good ...... or maybe hacking up an cheap saddle to put a cutout in it will be the solution.