trinity stage four pipes have to be one of the hardest pipes to tune to. every time my brother messes with his bike it takes us about two days to tweak his bike back in. i personally wouldnt tell anyone to buy them. unless you like working on your bike
i personally havent messed with flatslides that much, but roundslides you have to make sure they are in the right side and find that little notch they slide in. i think for tuning flatslides would be the ticket. someone correct me if im wrong