Sorry for the piecemeal writing; just learning to use the forum.
So this is what my crossover connection looks like.
The right and left pairs were already connected as shown on both speakers (notice the inconsistent red-blue placings). I connected the jumpers from the lower unit to the middle pair as shown.
The mids and highs sound awful; muffled and dull. The bass is sweet. I assume something is wrong with the way the mid and tweeter crossovers are connected. I've switched positions a few times but got nowhere.
Oh and yes, there are jumpers between the HF and LF posts on the lower unit, same as in the original post here.