wannabe faster

I was sailing on my lake this past weekend when I was outsailed by an Edel 540. Now I know that as a small keelboat, he has a bit longer waterline than I do hence his hull speed was more, but his biggest advantage was his genoa. He was flying at least a 150.
My question to you DS sailers is this. Have you ever put on a larger headsail such as a genny, and if so id the size (130, 150 etc) as well as a comment about the performance of your boat? Did it improve speed, or just heel you over more, and make the boat a bear to handle? Did it decrease weather helm or did the boat stay relatively balanced.
Now I know that the measurements prevent the use of a larger sail while raceing but, I'm talking about light air cruising, where the standard jib was sadly lacking.
My question to you DS sailers is this. Have you ever put on a larger headsail such as a genny, and if so id the size (130, 150 etc) as well as a comment about the performance of your boat? Did it improve speed, or just heel you over more, and make the boat a bear to handle? Did it decrease weather helm or did the boat stay relatively balanced.
Now I know that the measurements prevent the use of a larger sail while raceing but, I'm talking about light air cruising, where the standard jib was sadly lacking.