Were you Uni or two up? The jib gives the back side of the main a 'turbo boost' vs. sailing Uni, which is supposed to be offset by having less weight (no crew) on the Uni.
I've found in very light air, I'd rather have that turbo boost (with a very light crew, say, 100 lbs.) than go Uni. But in 10knots, a Uni should be able to keep up with the sloops, going upwind.