3K is about where the slides start to open. At that point, you are running on both needle jet and the transition jets. The way you read the A/F ratio is pounds of air per one pound of gas, so at 3,000 to 4,000 rpms, you are burning one pound of gas for each 10 pounds of air passing through the engine. This is very rich and the dips in the other curves tell you that it is costing you power. Depending on how your gas is formulated, you need 12.5 to 13.0 pounds of air to 1 pound of gas to make maximum power.
OK, I'm done. Yes, it looks like it would be a good idea to remove the shims.
