uniques should drop based on your level and their level requirement

the highest level requirement uniques should have the lowest chance to drop when your level 1

uniques with no level requirement should have the highest chance to drop when your level 1.. and slowly get HARDER to find as you level up with almost 0% drop rate at level 99

uniques with high level requirements should almost never drop when your level 1.. but slowly become easier to find up until your that level.

etc etc

if a unique has let say a level 5 requirement.. you should have the highest odds of finding that unique at level 5.. and slowly gets hard to find as you level

if a unique has lets say a level 54 requirement.. you will be very unlikely to find it at level and slightly better odds at level 2, 3, 4 etc and the best chance to find it at level 54.. after your level 55 it starts getting harder to find slightly so on and so on

doing this you can also completely remove magic find as a affix

while i am here.. every armor should get a random resist as an implicit

No thanks it's already near impossible to find The Surrender

Thus, the chances of finding a unique lvl 40 item required for your endgame build tend to zero.

did you read my post..

if the unique had a level req of 40.. you would have an "average" chance to find it at high level since u max at 99

its a sliding scale dude.. im not talking huge %s's here