I think its a kmc of hand, Not a kool. And my chain line is near on. The freewheel is 6 days old. The back sprocket on the other hand, Your guess is as good as mine. And as for tension tight but not over the top, The chain is snapping via the links and pulling apart. Though I have been told no matter what type of biking I do, My riding style is very hard. As for using the brakes or chain on the back wheel, I mainly use the brake but I rely on them both. Also im sure using a freewheel with very few engagements, Probably dont help. Plus I dont use split links I dont trust them.
Thanks for all the posts so far, and Im also not worried about weight yet. I want a chain I can use durin a drop gap, and not have to think is this going to hold.