i learned a lot from just a few pages reading about it, and stumbled upon 1 page
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guy, used a different way to make a candy rocket, he disolved it in water to make te KNO3 crystals finer, so i tried that and now i had way to much thrust and blew my motor to pieces. :-D so now i'm looking for the right nozzle size that will keep my engine in 1 piece.
i did not put a lot of time in it yet, due to propellent testing but did find a page in germany (i'm from the netherlands) so, maybe a trip to a german rocket testing day will come up soon, who knows.....
There is no such thing as too much thrust, only inadequate motor design or construction. I suggest using some of the free software from the nakka site. That way you can design your motor on the computer, instead of destruction testing. I'd put top priority into contacting someone from NERO or DARK before doing any more "tests".
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