The general belief here these days, I think, is that verap at 360/day or less surely will not completely block busting, and might not interfere at all. At 480, it is believed to get more iffy. Because for a long time verap was an absolute no-no, we don't have a lot of data about all this, but it seems reliable. (Also, of course, CH/busting are not exact sciences to begin with, and also, I think fewer people are using verap, relying on the D regimen to do the preventive job.)
Just a note: It has been recommended by Batch (known here as xxx) to be sure to separate the calcium in the D3 regimen by at least 6 hours from taking verapamil, becuse verap is a calcium channel blocker.
Sure, you can bust before sleeping. I'll leave it to the greater experts to comment on the practicalities of this.
MM dose recommendation these days is typically 1 - 1.5 grams of dried shrooms. The key issue is to be sure you get enough, since there is no real way to tell whether that has happened (slapbacks suggest that you got enough, and a light trip or a more serious trip also indicate that you got enough). If you're comfortable with MM tripping, I think most people would suggest that you start toward the higher end of the range. If you're not comfortable with tripping, you can either just do it anyway (with safeguards making a good trip more likely -- set and setting, and maybe some kind of sedating medication), or you can start lower. I keep harping on the fact that in the early days, this was the recommendation: "the range for a cubensis dose will be from about 0.5 grams to 1.5 grams. With more powerful species such as Psilocybe azurescens or Psilocybe cyanescens, a quarter or half a gram will be enough." (https://clusterbusters.org/forums/topic/683-4-the-psilocybin-mushroom/) Those pioneers were not making this stuff up, but unlike today, they were more concerned with minimizing tripping (and the early research articles invariably referred to a "subhallucinogenic" dose as being sufficient). I think today's recommendations are higher for the reason I stated -- being sure you got enough so you don't "waste" a dose, with less concern about whether or not there's a trip. But the trip is not therapeutic; it's a side effect of the therapy. That's why I favor RC seeds.
You can read more about busting protocol (and RC) by clicking on "New Users -- Please Read Here First" within the blue banner near the top of each page.