You need to actually read up on the volcanic implications if you are going to use it. Yes, it seems like it played a role in the strong PV that season, but that eruption was different on that it released a ton of SO2. This one was all water vapor. Pinatubo also had a drastic effect the very next winter....last season was a near neutral NAO in the mean (slightly positive) with two major episodes of blocking.
There is not much of a signal for solar max....however, ascending solar is linked to negative NAO and descending is linked to +. We are still ascending.