Itroduction
I've had a similar topic a few weeks back (viewtopic.php?f=5&t=1984) in which my questions were not very concrete. I'll summarize my previous post: I love MedianXL but I hit a serious roadblock with some uberquests before. I posted some outdated screenshots of my 3 year old char and received some nice tips.
What changed
Fast forward to today. I've been playing the latest MedianXL and got to where I originally was 3 years ago. I think the gear on my char is substantially better than last time, but I'm still having problems I feel.
Gear/Stats
In this section I'll present everything about my char that could show where it's lacking as I don't seem to be able to find out for myself.
I can handle any batch of monsters generally and absolutely crush any monster on one-on-one. (excluding ubers ofc)
Primary stats

The ice elemenatals that apply the frost armor aura die instantly to poison and fire... so they are only around 50% of the time.
Secondary stats

Gear

Charms

I also have Laser Focus Crystal, The Butcher's Tooth, Scroll of Kings, Sacred Worldstone Key, Sunstone of the Gods, Harkon Crystal Gem and Hammer of the Taan Judges.
Skills

Questions
The general question is how to improve my char. There is a recurring problem/possible solution, but I'm not sure how to achieve it. Here are concrete encounters which currently feel impossible:
1. Akarat - I die in 1-2 hits and there are 20 followers doing multihit/aoe hits with flying hammers. I literally die in 1 second if I engage with more than 3 of them at once. This one is very strange as I have killed Akarat many times 3 years ago. (I also had his trophy) My guess is that either he has been buffed or I'm messing up in a new way.
2. Legacy of Blood - I can only survive until most of my summons die and the golems will go for me. Leaving and returning does little good as the elementals are sort of stuck at the entrance for a few seconds and I get focused. If I had aroud 5x the damage it would be done.
3. Azmodan - I rush in, teleport to him and I die while only taking about 25% of his HP. It varies a little but some elite monster with unblockable cheapness will get me. Usually the stone hammer gargoyles. I do not really have the option to move or flee. Trying to teleport out usually gets me killed since they interrupt it 7/10. I seem to lack damage here too.. not sure.
4. Creature of Flame - I think I cheesed this with as a caster 3 years ago, but it should be possible with melee too. I have got its hp down to 50% then all the guardians died. Basically I hardly did any damage to the boss and my aoe hits chipped away the guardians who followed me constantly.
5. Infernal machine - I can't kill it before monsters fil the room and I have no more space to dodge the instant kill thing.
6. Baal on Destruction - The shard minons overwhelm me.. I need more damage here too.
Some of these would require about 2x-4x more damage. Akarat would also require for me to live more than 1 second. For more damage I can and will farm for a better warp blade, but that takes time and I'm not sure what else is there to do. On defense... I've got nothing.. obviously a better chest armor, but I can't see that being a difference for Akarat. I'd need a miracle. I've trought that I could clear travincal/upper kurast and kite the followers away.. but that seems like cheating... I think.
7. I've been looking into guides and found many recommending to use speed calculators... while I understand how they work I'm reluctant to use them. I don't feel it's cheating, but I don't think I should need it. Do I need to optimize and calculate every point and percent on my items? Does it give a noticable difference?
Conclusion
I think I'm far better than before (I hope I'm right), but there's still much to improve upon. I'm looking forward to some helpful tips.
Thanks,