Why are you using the old preset? It made some of the levels uplayable.
Here's an easier comparison. The dark is darker. The light stays the same. You can't do that with SweetFX.
and while I'm here... Some people on reddit posting that my preset wrecks the daylight sections. I tried to keep the daylight sections close to vanilla but with slightly darker shadow areas.
https://www.youtube.com/watch?v=1ceY10Shrq8
To start off, I've noticed that your Youtube video has a lot of compression on it, and a while back I made a tutorial that gets SIGNIFICANTLY better quality out of youtube videos that I'd like to recommend to you.
You can check the tutorial here.
It's a bit outdated as to the methods, but the basic idea is the higher the resolution of the uploaded video, the higher Youtube will make the bit rate. The example images provided in the tutorial give a good idea of how much better it will be. When uploading a 720p video resized to 4k the end resultant Youtube video was actually had a bitrate of 12,000Kbps, which is pretty damn high and good quality.
So in the future, when you're done editing your video, I recommend just exporting the same identical file, but exporting it at 3840x2160 instead of native resolution. The file size will end up the same with an identical bitrate, but the final Youtube quality when viewing it at full size should be much, MUCH improved.
As for why I use that version of your ENB, I've been tweaking it, and by default, I've liked that one the best so far. To be fully transparent, I haven't looked at your newest versions yet, last one I looked at was probably about 2 weeks ago, but I've been messing with and liking where I've got it now.
I'll check out whichever is the latest you've got. If you have a particular preset you'd like to recommend because I know you do a lot of variations on it, I'd love to try whichever is your most recommended.