Mr. King I see absolutely no reason that little guy is not going to be a fine little floater. The reason I say floater is just eyeballing by photo's and your figures it looks as thought you have a nice low wing loading. Also Just eyeballing agine you also have a lowspan loading due to a rather high aspect ratio (which is the span divided by the chord). Span loading is the span divided by the total weight. The way a low span loading will manifest itself in powered aircraft that are relatively low powered is the power on rate of climb will be improved and thats a good thing.

Not sure if that is a new wing or the old one but for the next one if it were me I would put the spars a little further aft and forgo the arrow shaft, Yes it will improve bending loads but do little for torsional (twisting) loads. and a wider 'D' tube section will improve torsional strength. The 'D' is what is formed by top and bottom spar with the sheeting wraped around to the leading edge and on the bottom back to the bottom spar, in effect a 'D' section tube. Yes the film covering will take a considerable amount of those loads. What you have now will work just fine. I would caution you to avoid very high throws on the ailerons for your first flight. Best to keep the throws rather benign the first flight.

Enjoy

John