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Please give me the benefit of your expertise.
I'm 6'3" (190 cm) tall and, though I have the largest sized-mountain bike available I'm bent over as I cycle because I can't push back my saddle any more on its rails.
Is there any way that to remedy this situation?
Your best bet would be to get a proper fit at a bike shop, that way they can tell exactly where you are stretched that you shouldn't be. It could be a simple fix or a more complex one.
The confusing part of your question is, if you moved the seat back further wouldn't you then need to be bent over further to reach the bars? Maybe the solution is moving the seat forward on the rails if your too folded up..
Or look into a lay back or offset seat post or stem size/angle adjustments.
The seat tube is generally fixed at 17 deg for all bike sizes. Because you can adjust saddle height, the relation between bottom bracket and saddle does not depend upon bike size. However, if your femur is very long in relation to your tibia, I could see how you might need to move your saddle back.
It is worth noting that most riders are able to temporarily exert more power by moving forward on the saddle ("riding on the rivets"). Having your saddle too far back precludes that position.
