When you ride a 300 back to back against a 250 you will notice the difference . Like for like state of tune . If a 300 pulls like a fourstroke then that is how the person set it up , thats moving away from the feeling a two stroke gives .
If a F3 250 can smoke a 600 , then a F3 300 will make it easier .

I change pistons on my 300 after using 200l of avgas and the bike is used for racing and track days . For me , it was a case of money well spent doing the conversion and in my case the grin factor has been worth it .

But you could get a gp bike by selling the nsr and adding the money needed to make the nsr faster
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NSR300