I see it was already mentioned, but i will add another vote for mounting it behind the reflector, get the mast out of the equation. The omni like performance is a combination of things, first of all it doesn't have enough directors to make it really directional, and putting the mast that close to the driven element in the same vertical plane might also be affecting its tuning more than anything.
But a darn nice looking antenna!! Where did you find the poly bar stock by the way??
Another consideration, if you go a lot bigger that poly is bound to sag and move around in the wind. You can easily alter the design to use an aluminum tube for the boom and have the driven element electrically connected, it wouldn't have to be insulated if you used something as simple as a Gamma Match on it. Easy to make and adjust. I can maybe post some pictures tomorrow to show some of the ones i have made if i get time. I usually take a piece of aluminum sheet about 1/2" wide and whatever length i need and then form it around two pieces of rod the same size as the match and element, then a couple screws to tighten the loops to the element and match.
Do a search for Gamma Match and you will see plenty on the subject. Last one i built i took an aluminum block and drilled two holes in it then sawed it in half on a band saw, that made a super looking shorting strap.
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