Mark, if Kissena group rides are endurance paced for you, then we'll have to work on improving your racing strategy to get you to the front of the Cat 5 packs. Because clearly strength and fitness are not a problem.
I'm fairly neutral on incorporating weights during the winter months. As long as you are careful about your lifting form, your choice of weights and repetitions to avoid injury. I do like the idea, however of basic core exercise and stretching.
I do like the idea of using the computrainer sessions as your threshold workout. If you can avoid the siren call of half-wheeling your teammates, you can actually get in an exceptionally precise LT/AT workout without distraction.
But the problem is going to be that if you've done sprints the day before, then a threshold session, then you're going to do hill repeats, then you are going to be way tired on Friday. If the threshold and/or Computrainer slug-fest session happens at night, what kind of recovery are you going to get before you hit the hills? Are you an early morning, before work kind of rider? That's not enough recovery time for most people. Which is okay for a given training block within the larger macro-cycle of your training plan, but doing that week after week after week, all season sounds tough. Plus that's not enough variety in order to keep those muscle fibers guessing, stressing, and adapting.
Broadly speaking, getting stronger is about stress, recovery and adaptation. If you are not building in enough recovery time, your muscles cannot recover from the stressors of your previous workout and they will never adapt to the increased stress loads. And you will eventually get slower/weaker.
But, at the same time, I kind of like Jeff White's thought "Or just go for it...completely flaming out in May can be fun." If you are pumped and motivated to hammer, hammer, hammer right now, then as long as you have realistic expectations about what kind of racing you might be doing this season, then there's no real harm in your approach.