I'm looking to bump up to 10 gallon batches, at least some of the time. I currently use am 8 gallon megapot, and it's only barely acceptable for 5-6 gallon batches, to begin with. I am wondering if I should get a 15 gallon kettle (that would allow me to bump up to 10 gallon batches), but I don't want to spend the cash if I will only be able to use it for 8-12 gallon batches and not 5-6 gallon batches. Is it a PITA to brew 5-6 gallon batches with a 15 gallon kettle?