Joey,
You are on the right path. If increasing the current is not an option then more frequent real small feedings should also work. The problem with more frequent feeding will be the degredation of water quality and you will have to pay more attention to water quality and more frequent water changes.
Using your methods and considering the real small size of fish you are training, and the lack of prior domestication of the parents, if you get 20-30% of them feed trained you did good.
