If you want some recommendations for EHP and DPS values to shoot for or to see what sort of MP you might be able to run reasonably well, check that post out. It is based on my own experience with farming higher MP and scaled to match lower MP. I did test it at low MP also so it should work fairly well.
For MP7 I recommend around 276k dps and 375k EHP. Your dps seemed to match pretty well but if I'm using the site right, your EHP is only around 233k buffed and in Archon form. That's why you're having problems surviving, as others have said. Higher hp will help with burst damage while extra armor and resists will help with sustained damage and RD mobs. I recommend trying to get that EHP up to at least 300k before trying MP7 again, but feel free to use your own play experience to see what levels you need for acceptable play. Keep in mind the table in the link above is based on solo play with BM, so it is mostly just meant to be a guideline to direct you towards some goals. The values themselves are quite subjective.
As far as gearing, I would get a mempo. Assuming you can't afford one with CC, find one with a bonus int/vit roll, so 200+int, 50+vit, and stick a life% gem in it if needed. That will give you a lot of extra EHP from the large hp increase and the bonus AR. You'll lose a little dps, but you should still be fine.
I'd also work on crafting bracers, if you haven't already. The first goal would be high CC, high AR, and vit, even if you only have like 200-220 int. Ideally you'd want a double int roll with high AR, high CC and vit, but that can take a while depending on how lucky you are. Extra physical resist on it is a plus.