Lots of ways to go:
Toil - 300 GP
Ageless Words - 300 GP
Blessed Harvest II - 500 GP
Blessed Harvest - 400 GP
Field Mastery II - 100 GP
Field Mastery III - 250 GP
Leaf Turn II - 300 GP
Leaf Turn - 100 GP

Toil + Field Mastery III - +50% success rate, you'll get a HQ off brunt force at the end (550 GP)
Toil + Field Mastery II + Leaf Turn - +15% success, +10% HQ, chance at a brunt force (500 GP)
Toil + Leaf Turn II - 6 swings at 31%+ HQ chance, chance at brunt force
Toil + Ageless Words - 7 swings, chance at 2 brunt force swings
Blessed Harvest + Field Mastery II + Leaf Turn - 5 swings with +15% success, +10% HQ, and double payout per swing
Blessed Harvest II + Leaf Turn - 5 swings at +10% HQ, triple payout

All are 600 GP except the first two. I use the last one to farm up umbral rocks and fragrant logs, but I'm at 95% success rate and 5% HQ to start. It averages out to about as good as any other option, with tons of NQ to turn in for cordials.