It's hard to even say what a lot of forum bros are running. A LOT of UGL "deca" being sold isn't even deca. It's a deca/test blend being sold as pure deca.
But anyway, I'm not too sure the only issue with Deca is dopamine. Deca modifies seratonin, and vysopressin as well. Deca will saturate the pituitary after about 6 months of use. And that lingers for about 2 years thereafter. I think one of the biggest issues with Deca is just running it too damn long. Pretty much nobody used to use it for more than 8 weeks before the 90s. Now, it's not uncommon to see 16 week deca+test cycles.
The other factor is people who secrete androgens differently. For people who are hyper androgen secreters, deca clears out pretty fast and sides die down. For people who are hypo androgen secreters, yay fun, they may have limp dick for a good year after coming off.
It would be nice if deca sides were as simple as "lol prolactin guyz" - but it's not. It's a lot more than that, which is why caber doesn't fix an awful lot of deca dick problems. It's one treatment that helps some people, but not even a majority. And running caber comes with its own issues when on cycle
https://www.ncbi.nlm.nih.gov/pubmed/9467544
Crushing IGF-I levels is probably not high on anyone's priority list for running a 19-Nor.