Have you confirmed that the oil leak from the hose at the turbo is actually that?

I ask 'cause the oil drain for the oil separator in the air cleaner housing is right around there, and if even one of the mounts for the air cleaner housing is broken, it's a fair bet that the nipple in the air cleaner housing disengaged itself from the metal oil return line, and that may be the source of your leak.

I've got this problem; if it weren't for that, my car would be leak-free.

Just something to check...good luck!