#1: My '09 Bengal came with factory installed CCS and STS.......the factory cable was 1/2" longer. With that exception, all else was the same as the standard model.
#2: Agree w/Brem.
#3: Agree w/Brem, although I'm not personally convinced yet that the CCS really does much, but sure doesn't hurt either, so if it comes with it, great.
#4: My guess for your set-up would be 270-275.
Even though by my old school standards a 380gr grain arrow isn't what I would call heavy (I use 425gr & 465gr), you are loosing some from IBO.
Estimates I use based on measurements I've taken on my Martin bows are:
1" Draw Length = 10fps <-10>
1lb Draw weight = 2.5fps <-25>
4.4grs = 1fps <-7>
Then for string accessories it varies, but I've typically seen only +/-3fps for all items you mention.
That reminds me. Did a speed check last weekend comparing a tube/peep (56gr) vs G5 peep (4.5gr). On my set-up, the gain going from yube/peep to G5 peep was 5 fps.
Added cat whiskers later, approx 3" from cam/wheel, for a loss of 2 fps
2009 Martin Bengal M2 Pro Cam w/factory STS & CCS.....66lbs, 29" DL, 422gr @ 272fps, Winners Choice string/cable, Trophy Taker drop-away Rest, Scott Release
1996 Martin Firecat XRG Pro Series w/Ultra Sonic wheels.....69lbs, 29" DL, 465gr @ 245fps, w/fingers & Martin leather glove