I make all my own bait and I routinely use baits between 8-12mm, hookbaits are 11-12mm pop ups hand rolled on 10mm cork balls. Like Yonny said, size isn’t my main concern. I’ve got confidence in my own mix, it does the business, I use these sizes as I get more baits out of a mix! I have hand rolled much larger baits, but I’ve not really noticed a difference in catch rates over the sizes. To bait up at distance with smaller baits, I’ll use stringers routinely and a spomb to hit the spot. To be honest, I often fish marginal spots so it’s just a case of nipping round, baiting the spots then casting the hook bait to it. (Never the other way round if fishing alone)