shotgun shell advise

the last 4yrs ive been shooting estate shotgun shells,first bought them as a back up dove load,got to shooting them in my 20ga. auto skeet choke for dove and skeet,really liked them,killed lots of birds and was shooting 19 to 21 skeet average..7\8 oz. no.8s..and the price has always been good on the case size..this year in sep. i had used up what i had left from last year on a tx. dove shoot so when i got back to the southeast and before our fla. season opend i bought 2 cases of new manufacture dates,i heard that estate cart. co. had sold out to fed.but didnt think anything about it,but they have changed the whole shell,new outside case,new 2 piece wad and i dont no what else,needles to say my average has droped way off on live birds wont even commint on my skeet shooting,patterned these new loads, about the same as old loads as best i remmember(dont have any older shells to compare with,shot them all)but they dont feel right,anybody else seen this with these federal promo loads..also has anybody tried these rio shells i see for sale now,id like to find another brand i can find easily or should i just go back to shooting doulble As and be happy...one more thing, idont reload and some where i saw advertizes a shotgun shell with a bright marker in the wad to help show the shooter where his shot charge is going(just dont know where my load is going,i cant belive im missing so many shots,got to be some reason)...any comments or help would really be helpfull...richard