When you say you interested in doing the ride at a brisk pace are you looking to do the ride like your own version of the RAAM but with nicer scenery? or are you looking for it to be a giant training ride? or do you have a personal challenge in mind to average 100+ miles a day & averaging 16 mph+ for the trip?
Or.... do you just not want to feel like you're dawdling?
Answers would also depend on how much capability you have on a bike. If you're a Cat 1 or 2 and you're 25 years old then you could do a lot more than I can at 55 who hasn't ridden competitivly in 30 years.
The thing about maintaining a pace on these trips is you always have to leave at least some gas in the tank, for the end of the day, for the end of the week, for the end of the month, because the days and the miles keep coming.
Even if you're staying in a hotel (far easier), you need to do your laundry, you need to go find someplace to eat, bike maintenance, groceries for the next day. And if you're camping you got to make and break camp and cook your dinner. All much easier to do when you're not blurry w/ exhaustion.
Before my trip I had never ridden a bike with a rack, much less panniers, so I showed some caution as I learned what to expect. If you haven't already done so, you may want to take a 4-7 day ride before hand and see where you are after repeated long days.
btw: If the answer is yes to any one of the 3 questions I posed in the 1st paragraph you probably want to see if you can talk anyone into providing you a personal sag.