You need to think in terms of circuits. Sitting at idle in the driveway, you'll be using ( you guessed it) the idle circuit! The 2 needle valves can effect your readings at the AFR... that's it, they will do little else for this conversation. The jets you speak of will only work off idle, so changing them to any number and then doing readings at idle doesn't work.

That's why I was saying to drive the car around and at different rpm ranges, then take readings at a given rpm/speed! There is also a power valve for wide open throttle,these are known to leak on some carbs. So you will have an opportunity to get the opening value when you have it apart. With that number on hand... get a vacuum gauge and take a reading, usually you use a valve that's 1/2 of what ever your highest reading is on the gauge. But if you want to "tune" the valve you can use a higher or lower setting to open the power valve sooner or later as you desire. These are all just basics.. I'm hoping you can report back that you found some debris that fouled the carb and get rid of those huge jets you went to! LOL..