Need more info. Injection size, gas or alcohol, nozzle size, and pump size. Hilborns are drop dead easy once you get the hang of them, off the top of my head i would say way too fat. Have you done a leakdown on the barrel valve setting. Hilborn recommends starting at 25% with the butterflys set at .002 open, all the ones i've worked on usually wind up at about 20% when well tuned, i've even seen them to like 17/18%. If you don't have a leakdown tester, roll the barrel valve closed until it stumbles when you bip the throttle, then turn it open turn 1 flat at a time until it doesn't. This will get you close on the barrel valve, the rest is in the return pill.
JMO
Zip.