Good way to avoid bird problems is to join a syndi that shoots them or allows a team of non native mink to stay on the lake and deal with those that can't be shot. bit of a sad trade off to see all that seasons cygnets and moorhens killed but at least you can bait the margins. they also put handy traps out here and there, they don't mind bending the rules a little to keep us anglers catching.
Spod mix is ok but i have found if you are only fishing for single bites and not feeding, a few pellets and boilies work best spod mix is something you would want to use when you are putting it out all day regular Not saying carp are clever animals more fussy they like what they want and if they don't want a big dinner it could be that that sends them off to the other end of the lake, funny sods.