Hmmmmmmm . . . actually, Lynda, that's a pretty good 8-week schedule you've developed.
A couple of thoughts (just one little Baldie's suggestions):
1. Make sure, if possible, one of your walks is a hill-walking route. Also, develop your walking protocol using music that is increasingly up-tempo, so that it really makes you breathe hard. Twice per week (ideally) at work I jump into my Stupid-Walking-Goblin outfit, throw on my Walkman (in case anyone remembers what that is in this Era Of The iPod) and walk using tapes of my aerobics music that go from 140 to about 150 bpm within about 25 minutes. It would be the walking portion needs to be upkicked in the speed department.
2. In your leg resistance training, omit step-ups so that you're only doing them once every two weeks. Even if your routine for that day includes them, just hit the "next" button on your remote OR substitute squats, plie squats or lunges. Step-ups / leg presses are the single most effective mass-builder for the gluteal muscles (especially the glute-max) and it's easy to hit a point of diminishing returns with these, where you're doing more than you need to for functional strength in that area.
IMHO, it's easy to overdo leg and glute training overall. Because we walk on our legs and use our glutes constantly when walking in the hip-extension phase, and because these are large muscles capable of great strength and mass development, they are constantly being worked and actually do not need quite as much attention paid to them in terms of time spent in a strength training set. My suggestion is to play around with your DVDs and discern how LITTLE leg work you can get away with and still reap benefits.
Also, it could very well be that during your illness and your hiatus away from exercise your muscles, including the glutes, simple shrank (shrunk?) and the "puff" your experiencing now is simply a temporary one in response to a renewed fitness program. Often there will be a blossoming of the muscles and then they kind of pack themselves down as you get more time in to your training program.
HTH -
A-Jock