Hi, I've been processing two 120s on a 2502 reel with a 2521 multi-tank (CPE-2) and would like to process at least 4 rolls of 120s at the same time but jobo thing is a bit confusing... 1. Do I need a 1520 tank with two 1501 reels? or is it a 1540 tank with two 1501 reels? 2. I've heard that I might have an unevenness problem since the 1501 reel is smaller than 2502. Is it true? 3. How much ml developer and blix do I need for 4 120s? Double it to 600 ml? or more? Many thanks in advance!