I have an 89 Nacra 6.0 that was morphed into what ios now called the Express. One of the Original Express Models (Jim Moody's old boat, with Randy Smyth as horsepower director).

I currently have a Square top, boomles (and no clew traveller) main, with the Express Genoa. Squaretop wrks great, lot of freakin horsepower, the Genoa is great for jib reaching however it is so big that it is led way outboard in comparison to your earlier version of a self tacker. With the Genoa you just cannot go upwind, not only is the sheeting angle to wide and outboard, but in breeze the jetway that is created blows back into the main and inverts it, making th emian somewhat usless upwind, so we just furl the genoa up in breeze over 10-12 knots. I have the Express 450sq ft chute, but also have a tiny I20 chute for funsies and a Smyth (regular?) chute that the leech falls in column with the mast. The Expreess chute will not really reach, just goes deep.

Recommend keeping your jib the way it is, you can make a traveler control, going with a square top, and going with waht I call a regular chute, for racing your DPN should be pretty good.

Craig
NAcra 6.0 HoofHearted