I'm no expert in routine programming (nor indeed lifting in general), and one of the reasons I registered just now was to ask some questions regarding programming and particularly de-loading.
Looking at th numbers you listed my intuitive first thoughts were:
1) The drop in squat weights may be partially attributable to a change in squatting style, if you previously haven't done oly style squats
2) If this is representative of your regular work on any given week, the intensity is quite high. You go to the 90-95% range in oly lifts 2-3 times a week for both lifts. That's a lot if you do it constantly. In addition, you squat heavy on all three days. I get a feeling you may be going too hard for your body. The volume x intensity may be just too high at the moment. (Keep in mind this is a guess)
3) How does this fit into your longer program cycles? How do you work up to this level of work and how do you deload after it? Part of what I've learned (which admittedly isn't much) over the years is that it's easy to get sort of stuck on the heavy weights at the end of a cycle and feel like you're doing just fine and do too much / too heavy work when deloading, or even skip the deloading altogether. This easily leads to several weeks with workloads similar to the one you described, which in turn usually leads to disaster i.e. overtraining. The symptoms seem to be there: decrease in performance despite good, hard work.
You mentioned you have a coach so they should have taken this into account, but frankly, you never know.
Like I said, these are just my first impressions based on what is admittedly very limited information regarding your training. Bear in mind I'm no expert either, but I have in the past seen similar things happen both to myself and to people around me. Unless there's something dramatic going on (illness, big drop in bodyweight, too much work stress or what have you) big falls (I'm assuming your squat 1RM has decreased some 35-45kg, which should just not happen) usually indicate something's wrong. Also, I've seen plenty of people switching from powerlifting to weightlifting experiencing problems with their programming and periodisation, which I had a gut instinct might be the case here.
Turned out a lot longer than I'd intended. Take out of it what you will, maybe it'll give you something to think about or maybe I'm missing the mark.