Two nches is very impressive! Most ive lowered someone's saddle was about an inch and a half. And they were six inches taller than you.
Forget the stem, now ride it and see how it feels.
charge spoon on the mtb, decathlon cheapo on the new road bike...
it would be worth swapping over the saddles if all the above advice doesn't solve it. I would have done that as the first step to rule out something very obvious...
Two inches?!!! 😯
Didn't see anyone mention stretching and yoga apologies if I missed it. Position is important but if your hips won't rotate and you can't touch your toes your body will always force your bits into the saddle when you lean forwards. Stretch daily and ride the road bike more and your body will adapt. When it does you won't need millimetre precision on saddle position to be comfortable. Between now and then just be realistic about your limits for riding and stop if you get too numb. Also mess about with position, you may well find something that works. Maths is not that something 🙂
You get numb on a turbo but you are fine out in the real world? There's your answer!
Rule #5
