Sounds like you are doing all you can do to max it out.

Sure, a gold challenge will get more points faster but only available once but if these meetings post quickly, you won't need it.

I think you need a checkout for all the room nights to post and bump you up to the next level, so you might want to monitor that closely and do a checkin / checkout rather than run 26 consecutive nights.

But if you stay 30 or more consecutive nights, you could get the occupancy / sales taxes refunded, which could be a chunk of change if you are paying for this personally, the extra points would pale in comparison.

You are leaving a ton of points on the table by not charging your stays to the credit card though but perhaps there are reasons like being forced to use a Company card or credit issues.

Good luck with your new hobby!