My local shredders just did pretty well in the EWS Tweed Valley. All I'm trying to say is that you can go every bit as fast on a 35 or 36 mm fork as you can on a 38mm. Personal preference is a whole different thing.
Not for me. If I'm out on my own I'm generally on the e bike. This will involve passing many people and I'd prefer to be able to let them know I'm coming and respond / chat etc. Having music on would make that more difficult. If I'm on the regular bike I'm almost always with someone else.
I am running an Eddy Current on the back of my Decoy. It's decent but not exceptional. Does seem to be wearing well though and unless it's horrible conditions, I wouldn't say it holds me back. When I replace I will likely go Big Betty.
Yes easy to find via Trailforks. Heartbreak Ridge has a nice straightforward climb and they've added lots of markers in so you can see where it goes..it fairly obvious anyway.
Fox site says 230:
https://www.ridefox.com/fox17/help.php?m=bike&id=689#:~:text=Maximum%20brake%20rotor%20diameter%20for,and%2040mm%20forks%20is%20230mm.
I had very poor experiences with both V4 and E4 previously. A hope evangelist waxed lyrical about how his E4s were so much better than my (admittedly crap) Code Rs. I tried his bike and they were laughably bad. However, a friend has these new ones and a brief carpark test suggests they are...
On the Decoy, I am running 220mm HS2 rotors with Code RSC. Yes, they make a huge difference. On my normal bike (Privateer 161) I am running 223mm Glafer rotors with Magura MT5. Again, a big difference and well worth doing if you ride a lot of steep trails.
FWIW - the Glafer discs seem as good...