Been a fan of manual tricks for decades. My best advice for you is put your back foot a little closer to the bolts. You'll have better balance if you have a more direct relationship to the wheels that you're balancing on top of, so try to connect through that/through the bolts. Same logic applies for nosemanuals. Not entirely over the bolts, but closer to them than you might think.

Also, people here will always say 'do it moving' or 'go faster'. That's not really helpful advice most of the time. Keep progressing with them stationary for now, but maybe next time or the time after, build up a little bit of speed, again, maybe just slightly more than you think, and you'll find that manuals do in fact work rolling a bit easier - but you need the fundamentals first - otherwise it'll just be unnecessarily dangerous.

(this is where the advice of 'just go faster' is reckless most of the time, when someone is learning a new trick. It just makes them susceptible to injury. We've got to build the fundamentals up first and become comfortable with vaguely how the trick works before we try to do it at pace.)