Tried that along with Proviron and didn't really make a big difference.
Try DHEA without anything else and no TRT at all to see the actual effect. The effects of androgenic compounds are not 'additive'. They interact and may cancel each other effect on sexual system because it depends on ratios not only on how much testosterone you have.
If that fails, I would try Anastrazole 0.5mg every other day for a week. It will give you a super boost of free testosterone and if that doesn't work then your problem cannot be solved by boosting testosterone.
Libido is quite subjective and can be impacted negatively even by work or stress. I typically have a much higher libido when I am in vacation. The best objective way to test for libido is by watching porn and masturbation. If you try with a partner, performance anxiety may create a negative feedback and kill the libido.