if you are squatting that often you can't try for a PR or max out every single day and do olympic lifting as well. It will work for a week or two but then you'll reach a plateau and that'll be it.The bulgarian system, was for elite athletes, people who have near perfect technique and have very high strength. When you reach that level your recovery is different.
Coach abadjidev(sp??) was very careful about choosing exercizes for them because they had limited recovery capability. If you look at powerlifters of the same level, the most common thing(that I see anyways) is they go heavy 1 day a week, maybe something like 6 doubles for a very heavy weight. The bulgarian system is kind of similar in the volume. The difference is they'd go for 12 singles over a period of a week.
The reason for this change, according to abadjidev is to keep testosterone levels high and it made more sense to him to train more often.Don't be worried about volume numbers, because a) the bulgarians lifted 2-3 times a day, you are only lifting once, b) you'll get used to it.
I think you are better off alternating one heavy one light workout(maybe do front squats on "light" days). If you want to do heavy weights low reps, try something like 4-5 sets of doubles with 90-95% of your max. Light days does not mean you'll do 60% or something, something more like 80% similar sets*reps can work fine.
If you are gonna try this start with 90% for the first week, then increase 2.5 every week. If you start as heavy as you can you'll just burn out and plateau faster. Its better starting a bit lighter in the long run.
Concerning warm ups, what koing said. I personally almost never warm up for squats after snatches and clean and jerks, unless I'm feeling kinda crappy (knees tight for example). If I squat first thing, then I'd do 4 sets at a light weight then 2-3 a bit heavier and then start the normal sets.