We have several J/29s and (had) J/30s at RYC in NJ which have been racing in our A2 spinnaker fleet. I think it is fair in winds above ten knots the two boats are very competitive. Blue Meanie and Fuzzy Wuzzy which are well sailed J/30s have consistently competed well against the 29s. In lighter winds the 30s do well against the fracs but the MHOBs become very tough. As stated in an earlier email take anything not needed out of the boat. Also spend the time to set up the rig (with Presto prior to centering the rig we were fast on port and not as fast on starboard. After centering the boat speed on starboard was more in line with the opposite tack.). Also make sure you are tuning for the wind conditions. Both fleets spend the prep time on the bottoms and also on the keel. Fresh sails will help with boat speed.
Crew work is critical as well as weight distribution. Having the crew weight forward is very important. We also play the back stay, traveler and main fine trim upwind to balance the helm. This makes a huge difference and we can keep our time vs the 29s. Downwind becomes more difficult for us (Presto) especially in light air, but Blue Meanie does better in this category.
My opinion is with the same level of crews the two boats are very competitive. The debate between J/29 and J/30 owners about the two as racers continues at RYC but there is no debate when it comes to the overnights.
I hope you enjoy your new toy and are competitive. If you have access to a trailer you should come East for the NAs. If you come early you are welcome at RYC for practice against the J/29s and J//30s. Even if the boat can not come and you can I am sure we can get you a ride to see first hand.