I don't/won't tatrget pike in the summer. The water in shallow lakes is too warm and they gas up far too easily, many die from toxicity built up, even though they go back seemingly well at the time.
In higher altitudes and latitudes you can get away with it, or in deeper water where the te,mperature of the water doesn't get so high.
I use a #10, but a #9 is OK too. An 8 weight is really only suitable where there are jacks only - but can you GUARANTEE there are only jacks, on Burnmoor Tarn I think, yes you can because the fedding is far too sparse. Anywhere with good feeding there will be big pike. It isn't for the fishinig that I use heavier gear, it is for the welfare of the fish, something that should be our main priority regardless of the species we are targetting. Even a jack puts a full bend in the #10, but the additinal reserve of power is handy when you get into a bigger fish.
Join the PFFA, it is worth every penny and you get to fish some exclusive waters plus have access to people who have been fly fishing for pike for many years.