Generating the rp neccesary to actually fill that 130 usually involves the streaky nature of rp generation that occurs with Scent of Blood and Sanctuary (it also can happen when things in the fight mechanics such as tank cc disrupts the part of my rotation where the FS weaving occurs. Rp generation actually peaks when the streaks of rp generation occur, but the higher ceiling gives me more flexability in deciding when and how the surplus is used. I am not sure if I am explaining this well, but the phenomena is there. Before I specced into scent of blood, however, I never had a surplus to worry about. I am sure this is spec and playstyle dependant though, because going off of recount numbers compared to other DK's I run with I tend to be significantly on the extreme end when it comes to rp generation.
Oh, and I just started posting alot recently but I have been reading your stuff for about 6 months. I am now one of the top geared DK tanks on my server, but it wasn't too long ago that I was barely penetrating the posts on here and trying balance out the information presented here with the often less reliable tanking lore that circulates on the server. (Because of the latter I am still confronted by far less geared tanks who think I must have ebayed my account because I choose to pick up a yellow socket bonus with a def/stam gem when "omg you are way over the def cap." )