Balance for Trial of Chaos and Chaos resist/damage in general

So these are technically 2 separate topics.

1. Chaos damage/resist
Chaos damage is not really balanced. The reason, I feel, is beacuse Chaos resist is so much harder to get. I am going slow this first run through and so I am at the end of Act 3. I am level 46 with Trade purchased gear. My other resists are maxes, but due to the rarity of Chaos resist it's just much lower (not because I am not prioritizing it). There doesn't seem to be chaos resist rune, which might be the one we need the most!

It feels like the game expects (and is balanced around) players having 50-70 Chaos resist but even with the trade site that is hard to do. I am able to handle several hits (including physical slams) from mobs (including bosses) but 1 chaos ability and I get 1 shot. Obviosuly that wouldn't happen if I HAD 50-70 chaos resist, but that really isn't an option. Either chaos damage overrall needs to be tweaked OR a low level rune to help with Chaos resist from gear needs added. It doesn't feel great when you are gearing for defense but you still get randomly 1 shot from any chaos ability. You know why, but you really don't have any tools to fix it. If the problem was "fire damage" (or any element) then I have charms, easy to get stats on gear, Runes etc. Yet Chaos damage is very common among mobs/bosses with no way to activly address it.

2. Trial of Chaos (1st run for 2nd ascendancy).
So I was able to do the Sanctum version for the 1st ascendacy at the appropriate level. While it took a couple runs to get a run of rooms that didn't brick me, it was possible.

When I got to the Trial of Chaos, I was able to make it to the boss where the tornado instantly killed me. This is a concern I heard from others so I decided to put it off until I got stronger. Now I am level 46 and I can breeze past most of the things in the Trial of Chaos, but I cannot get past the boss. It takes about 10 seconds until the tornado form and it hits you so fast. There seems to be no outplay here and it kills me in less than a second still. This seems dispropotional to the difficulty of the content directly around it. It doesn't make sense for all the trials to be easy but the boss instant kill the player with no clear way to outplay it.