Tighten up the secondary air door so there's more resistance to its opening. Most of these I've worked on that door has been set loose so it flops open when the secondary's are opened. That's not the way it works. As the engine needs more air and fuel that secondary air door opens against the air passing over it. Also a good wide AF meter can tell you the AF Ratio to adjust the jets, metering rods, springs, etc. Thats a great carb set up correctly. There's a couple of good books out there on setting it up. Always go for the low hanging fruit before you think about changing things up. You can chase your tail forever doing that.