A couple of questions.
Do you sail a lot in light air? Racers need great light air performance but not all cruisers. If you are like many and start the engine
when boat speed drops under 4 knots then you might be better with sails that are well suited for 10+ knots. Remember, that most modern designs like to be sailed with relatively little heal. Many people carry far too much sail for best performance. You current
situation is like having a reef tied in. Something more people should do.
How does she steer now? As others have suggested, balance can be more important than square feet. Weather helm
that requires 20 degrees of rudder
is like dragging a huge bucket astern.
Do you need new sails anyways? Upwind, new small sails with great shape will beat blown out bigger sails. Also - after considering balance - you could:
1. Build a lot of roach into the main. Besides helping downwind, the roach provides a lot more upwind power from the upper part of the sail. John Dashew used so much roach in his cruising boat series that the leach overlapped the backstay by feet (he found there was surprisingly little chafe). He writes about it in his Offshore
2. Have a new genoa
made with the foot closer to the deck
. This hurts visibility but greatly improves power upwind by creating an "end plate" between the bottom of the sail and the deck
. Much better than a few more feet of hoist.
3. As you suggest, get a nice big off the wind
sail. You might consider something flatter than a typical spinnaker
that can be carried somewhat closer to the wind
(look at the Doyle MPS sail)
All of this costs money
, but I assume you are saving some money
in the purchase price
due to the modified rig.