My journey has been similar, with the exception of blades. Only have 2 DEs left, and added some injectors. I think SE is my favorite now.Luckily, I've had my Vector for a few months. I tried Prolines first (B&B recommendations), but I'd initially assumed the alignment problem was an issue with the blade, rather than the razor, and decided to come back to Prolines after trying out others.
I sold my DE razors after my first shave with the Vector. I have had so many enjoyable shaves, and I would find it hard to pick a favourite blade yet, but if I had to choose, I would keep the OC baseplate.
I'm not keen on guarded blades except for Feather Soft Guard. I get on well with Kai Captain/Captain mild and Feather Professional (except for those first couple of shaves). I couldn't get an enjoyable shave out of the Professional Super, but I did try them quite early on. I may give them another go at some point.
I recently got myself a Sabre, too (L2 plate). I found it a joy to use, and I particularly like the feel of the GEM blades, but after two mornings I started reaching for the Vector again.
Maybe the honeymoon isn't over yet.
I came across rumours of a titanium Vector, which sounds exciting, but it does make we wonder about weight.