Rmayer;
Do you have a power valve in the rear float bowl? If you do, get rid of it and instead install a block off plug in it’s place, then install jets in the secondaries that are 6-8 sizes bigger than the front. So if you have 72's in the front, install 78s-80s in the rear. Run a size 65 power valve in the front metering block.

Next, get rid of the 50 cc pump and go back to 30 cc pumps. Install size 28 squirters in the rear, and leave the front at 31. Make sure that there is no slack in the adjustment arm to the accelerator pump.

You should be able to tune this puppy so that it seems as if it is fuel injected, smooth. Let me know! It would help if you let us know what cam and heads you are using as well.