There really isn't much point in a filter in a tank that small really.....a 1 gallon is far too much hassle to cycle(which is really the only reason for a filter with bettas). If you can, I'd suggest just taking the filter out all together.
As far as water changes go, 2 50%s and 1 100% a week is a good schedule for a 1 gallon.
As Lebron said, Wardleys isn't the most nutritious of foods....I'd suggest going and picking up something like New Life Spectrum Betta Formula, or Omega One Betta Buffet.
A feeding schedule of 2-3 god quality pellets twice per day with some frozen bloodworms or Brine Shrimp as treats for a little veriety is what I would recommend. :)
Everything else sounds wonderful! Virtual cookies to you for doing you're research, and welcome to the forum! :)