What sort of conditions, point of sail?
Lots of things, some of which may help:
- sail the boat flatter, less heel reduces helm
- Drop the traveler down, all the way to leeward if you have to
- Flatten the main... more backstay, outhaul
- use a smaller headsail
- Reduce mast rake (ease the shrouds, tighten the forestay, then bring your shrouds tighter)
- Sometimes, there's just nothing you can do. On a tight reach in a good breeze, a J/30 is a truck.