Bring him down 1/4oz a day, if he was flying and responding but not hunting at 1lb 5oz last year, then considering they normally fly slightly heavier on their second season I would personally aim at 1lb 5oz as a hunting weight.
It seems your bird is about the same weight as mine, so I'd guess he'd start responding at about 1lb 7oz.
There no rush, do the same as last year, getting jumping the length of the leash then onto the creance, don't take any backwards steps, if he doesn't come the distance you expect don't go closer leave him until the next day when he's a bit lower. Good luck.