Well,thanks mate !
I know that is not traditional thing to do,but every once and while we do something strange with our flies and some of them works...
CDC is not about floatability always,you are absolutely right ....
I fished couple days on dries successfully,on same spot,same time....third day I get none ....and fish still keep rising ...I quickly as I could tried different dries..nothing...than I tried klink&dink and got one brown on pheasant tail size 16 and miss couple fish.....
Than something clicked in my thick head
and I put those 3 on leader,bigger is size 16 ,smaller size 18....In next few hours I get them all