Spiral,
This is the exact problem with shamshirs: we are trying to reinvent the wheel!
Unless Persians were complete dolts who created their national weapon for purely esthetic reasons and then suffered its awkward shape, they must have known something that we do not.
Seriously, they must have had a system to handle shamshirs with extremely curved blades! But unless they codified this system in a written form, we will never understand how to wield this darn sword! As I said before, "If you did not write it down, it never happened". Very frustrating....
On the other hand, we may be imposing different standards: we are authomatically assuming that every sword should be fit for an intricate and controlled swordplay. Perhaps, Persians did not give a fig about "fencing" and used shamshirs as pure slashers....
Nothing "Eurocentric" about it: Westerners fell in love with Japanese or Chinese swordplay head over heels. They are foreign and exotic, for sure, but there is obviously a System. Western mind loves order and control and is ready to accept a different way of expression as long as it is codified. Perhaps, "Islamic" swordplay was not rigid enough and that what baffles us.
Where are all those art and arms historians when you need one?
The same pertains to the Yataghan.