[HeiriHornochse]

I had a bad experience with Duro tires. I ordered one for my Yamaha v-star 1300 ... ... the NEW DURO i had put on 400 miles ago had a huge knot in the center of the tread. NO MORE DURO TIRES FOR ME!!!

Well - this is an experience. And one, that must not happen, not on a new tire.
On the other hand side: according your bike list, this was <2007 and you tried it just once. I'll do a second try.
Once is never, twice brings up some question marks. Three times is the answer on the questions.