I do not, but have read from a few here that said most any local vet can do a fecal float test at a reasonable price and then you will know exactly what type to treat for and go from there.
How long did you try that method? It will likely take some time for them to get used to having free choice feed and stabilize their intake. I free feed. What should only last me 9.5 days, lasts about 12. Yes, a lot of variables will play into individual results.