I was (or am) in the same situation when I picked up my new bike. I generally ride about 30km a day on a short route and have been wanting to push further now that I'm more fit. On my Roubaix with a Specialized Toupe seat, my limit was about 45-50km before starting to feel extremely uncomfortable and wanting off the bike (i.e. constantly having to stand and re-adjust, etc.) I recently opted for a Bontrager Affinity RL (not the RXL) which has slightly more padding and while I'm now able to do 60-65km before starting to get uncomfortable, it's still not perfect. Unfortunately, what I'm noticing now is that I'm getting very localized muscle pain around my right inner thigh (only the right side) just forward of my right sit-bone. I suspect the additional padding, however slight, is causing some pressure. The Affinity RL doesn't cause me to go numb like the Specialized Toupe, which had the cut out down the middle (somewhat ironic.) I'm tempted to try the RXL before moving on to a different brand if that doesn't work out.

It's frustrating because my goal is to do 100km+ by the end of the summer, but my nethers are seriously holding me back and castration is just not an option.

I've found that proper seating position is a huge factor in how a seat feels as well.

I definitely recommend trying out as many saddles as you can. Good luck!