So you had your 75-7 stock motor replaced with a 75-7R?
In 2016 both the motor and the controller (and software) were different in the DS and DSR.
I'd leave it alone. Sell it and get a DSR if you want or wait for a new model Gen 3 DSR.
I have an old 13 DS and a 17 DSR and though the DSR does have noticeably more power, that DS in sport mode is still pretty dang quick.
When I looked at the stats for both the DS and DSR it showed the motors to be the same. Where did you find out the DS has a 75-7 and the DSR has a 7R motor? Can you link us to the info please?