Thank you Bill, as always the voice of reason I was looking for and a greatfully received reassurance that my thinking was straight on this one, hell by all accounts I might be getting the hang of this technology!
There are no plans for these rigs to be going anywhere near 4K as part of their roles as not sure how well the 1620v3 would hold up in that area, and we have several of their hex core bigger brothers to pickup the slack first if/when that day comes.
Stick it is!