Dan is being very open and informative with you, which is exactly what you want.
Your base shock is surely going to be a 8900 Series that has the 8900 Rebound Adjuster built into the bottom of the main shock unit. Old 2 way 8900s came with a 8981 external Hi Speed Compression adjuster that had only 6 "clicks" and really wasn't that good a unit in terms of damping curves in general - so I'm told. Later 2 ways came with 8986 external unit, which is what mine came with 2 years ago. The manual had a super big mistake in it. The manual said full soft was when the adjuster was turned in to the body, which is the opposite of what is correct ! I don't know what unit you are getting or if the manual has been corrected, anyway, a word of warning from my experience of tearing my hair out as the bike got softer as I thought I was adjusting it harder ! (by the way, the manual mistake comes from the fact that on 3 ways, the high speed compression adjustment is full soft when the adjuster is fully turned in to the body). Back to my experience with the 8986. The manual said there were 22 clicks. They were almost impossible to feel, and I never detected anything like 22. I lightly wound it in full, then backed it out full, and counted 5 1/3 turns of the adjuster. There are 6 flats on the head of the adjuster, so I called it 32 "clicks" and just counted how many flats I had used. Because of the inadequate low speed compression damping my unit had, the only way I could compensate was by cranking in the hi speed compression adjuster. I ended up using 4 clicks out from full hard, and it rode like a truck over sharp bumps on the street. On the track it was harsh but handled better overall and I went quicker. With mid point settings and my not heavy wife on the back, the rear end would yo yo at the slightest thing, and fully stroke and hit the snubber. Which is why I got my unit reworked this year.