You can use 2 YT PVA with one Private proxy. Make sure that the proxy is not blacklisted already, because most of the providers say that there proxies are good, but actually they are some how not good for YT anymore. Because, mostly they are already used with google/youtube (in some manner) for spamming.
I'm telling this, after getting feedback from my customers. No one would like to mention his source for proxies, if he knows that if he mentioned, those proxies will be spammed till death and he'll lose his own source of private proxies (**If his source is good for him.)