I think this whole hummer barrel thing is a friggerment of our imagination!!! Its all smoke and mirrors. CCBW can tell you that when Paul Wolf had that great hummer it was just a friggerment.
Pay attention to what Bart wrote about paying dues-practice and learning to tune. But, I think Bart will tell you sometimes your tuning methodology just don't work. If it worked all the time everyone would win all the time.
You can buy the best equipment, buy a pile of barrels each season, but you still can't buy a win! Bart, Billy, Tony, Larry and the whole bunch will tell you there is no substitute for practice with the same equipment, barrel brand/type, bullet brand/type, powder same lot, etc.
My problem is I find that boring and so I constantly change something, cartridge (22 PPC, 22 Waldog, 6PPC, 6-40 Dune, 6-40 Tyger) , barrel configuration (I've shot 3-groove barrels, 4-groove barrels, 5-groove barrels, yes 5, 6-groove barrels and one 8 groove barrel. Twists of 13, 13.5, 13.75, 14, 14.3, 15 and gainers) They were all fun but none of them were magic. The barrels I shoot WILL shoot if I just leave them alone!!! But I can't!!!
So, simple answer Tim, if you are wildly driven to win, keep at it and someday you will.