Hi, I recently bought sanjou 632(0.51mm) thread and it's too thin for the 3mm chinese diamond pricking irons that i have, but i like the thread so i thought about buying new pricking irons. I'm thinking about the basic 2.7mm(10spi) french pricking irons from kevin lee and from what i understand, for better results i should also buy an awl. Kevin lee has 2mm and 2.5mm awls. Other shops have 3+mm. What size should i buy?