But that's the thing, you don't have to chase bad teams if they are doubling if there's enough good single GW teams, and that can easily score more than teams that double. In a blank, you are competing with not having a player, so there's definitely possible to gain more in a BGW or a DGW when it comes to FH. I mean, it's just like your post above re: Haaland vs Solanke which is a classic DGW vs SGW situation.
It's also not just the recent experience of DGW 25 where DGW players failed, there have been a few cases like that before as well. Think there was one where people sold Salah for Chelsea DGW or something. So I don't buy into a DGW FH having a higher upside. The upside is the difference of points between your original and FH team and that can easily be huge in a BGW.
I've been around 150K so I don't really know whether to chase super hard.
Overall, having the majority of good players from good teams and going largely template is usually more than enough for climbing rank, you don't need to punt on shit players to do that. There's a lot of talk of selling Ollie in 31 when he's the best striker in the league right now. I've seem to come around to the fact that template works better than differentials when it comes to climbing rank.