I've tried this several times in the past few days, but it's not working with my 625. I can't pick which 625 to record to either.
I believe there's a list of FAQs on the site and one says something like -- at present, you cannot select a specific tuner for recording via remote access. I think it defaults to TV 1. I have also realized I will need to unblock my locals where they show in the 8000s on my guide. For some reason, remote access picks the locals in the 8000s versus locals in the channel 2-70 range.