what i would suggest pal is leave the chokes in what you go rough shooting with dont alter them and play about stick with the ones you have hit stuff with. you may want to change your cartriges though to 7s or 7 and 1/2 they will just give you a bit more spread on some of the quicker clays.
and one bit of advice i will give you is dont feel under preasure when your shooting by some of the other guns with all the fancy bollocks they walk around with it makes no difference to shooting its just bling, just chill out and relax and just picture every clay with a set of tail feathers lol
good luck