Were you not happy with the results that your previous system yielded?
Depending on your experience over the past several years (training age), I don’t know that you’d really need to include so much intensity work this far from track season. If you’re just ending a track season, perhaps you could consider getting away from the running for 6 or so weeks (longer if your main focus is the 800) and focus on improving power and strength, and then start to condition later if XC is not overly important. Sure, race a bit, but use it as a building effort for track season. It really doesn’t take June to March to condition for a successful track season at events up to 1500m.
If you are hell bent on conditioning all summer, I like your approach to some degree, but I’d add a bit of variety to that strength training (Though I am not overly sure I understand your “progression”). Three sessions per week of the same session you listed, and in no time you are going to stop progressing as fast as you can. Increasing the pace may be a good idea, but don’t force it if you don’t have it. Further, make sure to deload from time to time and allow your body to adapt to your hard work.
Sorry for the rambling, just some random thoughts.