Don't worry yourself so much about the BP and stuff. it shouldn't hurt at all if you wanted to go with just one application each day. I've always found that applying things at night works best because the body is inclined to heal and repair itself as we sleep. That's a key thing right there - a good sleep pattern. One of the things that can get in the way of that is stress and it certainly sounds like you find it pretty easy to get worked up about your skin. That focus on your skin may contribute to the acne, so it's a bit of a vicious cycle. It took me a very long while but I did eventually catch on that the best thought process to apply to it all is that you are doing something positive and your intentions are good. As long as you maintain a regimen and allow it to regulate what's going on, there's no reason why it shouldn't calm down over time.
The regimen you mentioned looks fine by the way, in case you were still unsure about whether you aught to be using the things you are. My regimen is kind of similar to that actually: Wash with La Roche Posay cleanser, got the Jojoba on hand if there's any dryness, and I spot treat with Isotretinoin gel rather than BP because BP burns my skin.
I can kind of relate to the situation with food, although I have been cutting things out. It's a very recent thing for me as it's less than two months since I found out certain things I'm intolerant of. Having cut those out, I'm acne free, but the things I cut are everywhere. I reduced dairy, gluten and yeast and I'm trying to cut out processed foods and things which are overly spicy. The processed food seems to be the tricky part because I kind of used to rely on that. I live with my parents so generally eat what they eat, but if I was cooking for myself at the weekend it would probably end up being a frozen pizza or something. Having cut that stuff out, I'm stuck for ideas and, from a financial point of view, it seems pretty expensive here to buy fresh foods and there's likely to be waste when cooking for one which I can't afford either.
I'd gone six weeks without eating frozen pizza and the eczema I'd had for several years had vanished without trace. Last Saturday, I ate a small frozen pizza and the eczema came back so I know for sure now that it was triggered by processed cheese.
I was walking around the supermarket yesterday, reaching for all the stuff I used to buy, then realising that I can't have it if I want to stay acne free. For about ten minutes, I was the ultimate cliche - single guy, grocery shopping for one, not having a clue what to buy unless it came in a box or could be microwaved...
Having thought about it a bit, I guess it's all about education. If I learn what the alternatives are and find out what I like, I can make it interesting and skin-friendly, rather than feeling as though it's difficult and that I have to try avoid loads of things.
By the same token, rather than being obsessed with the food thing in a sort of negative way, perhaps you could look upon it as something new and as a positive change. If the foods are good for you, skin-friendly, and if they also happen to be things you enjoy, then it's a win-win situation and that positivity encourages you to keep it up.