there are a couple things that you could try that have worked for me in the past.
1. Try the fighting purrs if you have 2 calls. A lot of times if a bird is hung up and the simple yelps, clucks and cackles are not enough, the imitation of 2 hens purring at eachother will bring him closer.

2. You can try the hen moving away approach. (this can be risky) start by calling away from the tom to imitate a bird walking away from him. I usually continue to call fairly aggressively when I do this.

3. if the terrain permits BELLY CRAWL him!! that's the most fun too.

good luck. Once again these are just things that have worked in the past for me.