[Lottery Larry]

" I like the idea of 15 minute rounds per game, but raising the blinds/bets every 30 minutes."

You might find that having two circuts of each game type, then raising the limit and changing the game, gives you a better chance at getting a rhythm going (and getting some hands to play). You don't want to change limits in the middle of a round, do you?

"My smallest chip denomination is $.25. Is that too high for a $20 buy in?"

80:1 doesn't seem bad. Save yourself some hassle- have the dealer antes for everyone (one bigger chip) rather than requiring everyone to ante each hand.

Good luck, report back!