Right. Make a list of all race categories to avoid:
1. Stakes
2. Maidens,
3. Turf
4. low class claimers,
5. 2 years olds,
6. lightly raced,
7. 'suspicious' tracks (CT, MNR, PEN...)
8. bunch of Earlies
9. bunch of Non-Earlies
Then one by one, specialize in them until you find what works. Sounds like you've got #1 checked off...
yours,
Ted