Best way I've found to jet on dual carb set ups is with an exhaust gas analyzer...Maybe a friend who works at a shop or something could let you borrow the machine and a bit of time???? Takes all the guesswork out of tuning for jet size. I'm suffering from CRS on Holley numbers, are these the vacuum secondary carbs? If so, once you get the primary jetting correct changing the springs on the secondary diaphragm should probably be done in conjunction with re jetting.... Mike P is very good with the multi-carb set ups, he has a good thread or two on here about making them work correctly.