Why faff around making paste? For roach I would stick with flake or punched bread. I'm with ceaserson, if they are having it they will have anything ......
I was reading a magazine the other day that states that using fennel seeds/corriander in groundbait and paste is the thing nowadays when targeting roach.
Not this time of the year maybe September or possibly early October, give the biggies flake or if you are feeling generous cheese paste. For me at the moment looking at the weather just bread flake.