Like everyone has stated the proof is in the flying. I scratch built a Sweet Stick a year ago and with my usual extra bracing and and extra heavy wood it came out at 6.5 pounds. At least 8oz over the weight listed on the plans. I had no choice but to fly it. Guess what? It flies just fine. I like it better than my GP Sweet Stik with a 4oz lighter wing loading. My sweet Stik has a 22oz wing loading and takes off just as fast and lands just as slow as the bigger GP stik. Plus it feels so solid in the air. Its a real pleasure to fly in spite of being a lardbutt.

I think you are worrying too much about nothing.