after more research and more coils i found the following.
316 and 304 work equally well, the main problem on the koopor plus is that often it will read too high of a resistance which increases the temp far beyond what it should be and leads to cotton burn/flames in my mouth.
If you have another mod or one of those ohm readers make sure you know what the resistance is at room temperature, if it reads correctly on your koopor your should be ok just using the 92 and 105 tcr for 316 and 304. If it reads high you have to go in and adjust the resistance down as low as you can get it, if it is more the .1 more then it should be used in wattage mode as you will get flames otherwise.
The second most important thing besides the resistance is, spaced coils only! I was not aware but if there is any contact on the coils the readings will be off and temp control will not work properly which again leads to flames in your mouth.
As you can see i have had many flames in my mouth and we shouldnt have to go through all this so IMHO temp control for SS on the koopor is not working. Hopefully a software update will fix these issues in the future but for now its wattage mode only for me as that's just too much throat hit