Hi
When i see my character has “80% elemental RES(over 200%)”, i want to kill myself.
PLS do something for my life
ty for reading 
What is it you are asking for:) Use items to spread your resistances out more.
a 20-30 overcap is healthy. Otherwise, you just have too many items/affixes with elemental resist
Suggestion: what if each +50% of overcap automatically becomes +1% max resistance? Makes sense for those who collected ~+150% occasionally.
UPD: nope, this will make Mogdrogen fights (for example) extremely hard.
Bonus maximum resistance is an op thing by design and therefore needs to be strictly controlled. The difference in effective hp between 80% and 90% is like 60% vs 80%, or two times in layman’s terms. Caps always serve a purpose of limiting stuff that can break the game.
Max res for overcap is basically asking for softcap instead of hard one. I’d personally prefer no cap at all and make resistance have a linear effect on effective hp (like armor in DotA) instead of exponential one. But it’s too late for that.
As for practical advice see fluff’s answer.
That is what +% Max Resistance bonuses are for.
i know what u talk. But When player make elemental build, ele resi is going to be over 100% very easily.
OK, ill try making my build better as i can possible.
ty for reading my english and replying 