It's normal for the curds to taste bland and not at all acid when it's a washed cheese. It's a good recipe and I hope that your cheese turns out great.
I make buttercheeses all the time and I have never been disappointed. It's very mild but still with a nice round taste. I usually age my buttercheeses 14-28 days. If aiming for 14 days (for a very mild version) the curds need to be very soft when pressing to ensure enough moisture for the bacteria. If aiming for 28 days they should be a bit firmer but still very soft.
Buttercheese is great for melting in sandwiches and for people not into strong cheesy flavors.
By the way - I find buttercheese to be a bit tricky when it comes to keeping the rind free from mold (it is not that acidic). I wax mine after a couple of days. Several times I had to peel off the wax because the rind was not sufficiently dry when waxed. I think that my biggest issue has been that I have placed the cheese in my cave at 85% rel. hum. right after brining. I think that it is best to let it dry at a much lower rel. hum. before placing it in the cave to allow the surface to dry some more and avoid mold problems.
I'm looking forward to hearing more about your buttercheese!