I went with the B17 Imperial, too, as I've found that I can't have any pressure on my perineal area. I tried the Professional, but, it was too crowned and knew right away that it wasn't going to work.
I bought from Wallingford Bicycle Parts, because they have a 6 month return policy on Brooks. I didn't treat the Professional, as I was initially looking at shape and size. Likwise, I'd recommend the same to others. The return saddle must be in new/original condition for re-sell.
The best way to break-in a Brooks is as follows: Take a piece of tin foil, pour a bottle of neatsfoot oil into it, wrap that around the saddle for about an hour, remove the saddle and pour the remaining oil back into the bottle, leave the saddle sit a few days, mount it onto the bike, and ride. I regularly treat the topside of the saddle with oil. Periodically, I flip the bike upside down and treat the bottomside, too. This puts oil into the leather and allows it to be very supple from the first ride. Because the leather relaxes so quickly, you may need to adjust the tension sooner than expected. And, remember to only tension 1/4-1/2 turn at a time and puts some miles on it before adding more tension.
As for the saddle attitude, correct saddle selection and fore/aft position is as important as angle. Really focus on where you're feeling the pressure. If you're feeling it right down the middle, no matter the angle, I'd say you're on the wrong saddle. You may investigate the Imperial, if your sitbones feel properly supported and it just perineal pressure. If you feel like your sitbones are on the edge of the saddle and that's why all the weight is down the middle, then a wider model (B68) may be better. I wouldn't look at any of the narrower or more crowned models, as those are going to centrally concentrate the pressure even more. Now, you need to consider fore/aft adjustment. If the saddle is too far rearward, you'll get the same pressure up front as if you had the nose tilted too far up. Likewise, if it's too far forward you'll only feel weight at the rear and nothing on the front. Many people only adjust angle, without considering fore/aft adjustment. The angle should be level or just slightly nose high.
Consider moving around on the saddle frequently. The nice thing about Brooks is that you can adjust your seating position without feeling like you're not sitting in the saddle's correct position, if that makes sense. I always move fore/aft, sit upright on the hoods/bars, or relax on aerobars (in my case). Constantly moving around allows constant blood flow to all areas of your rearend and vital bits.
Lastly, this process may take a while. I took adjustment tools along for a couple weeks, as I figured out my positioning. I mostly ride alone, but, the constant fiddling may annoy any companions, if you ride with someone. I've tried plastic based saddles, but, after the padding breaks down, I'm riding on just the plastic--that has no give to the rearside. On the Brooks, I can regularly ride centuries with no discomfort, just fatigue.