+3 on Gatzen vids. I discovered them about a year ago and have been obsessing over tuning ever since. I think I can honestly say that I've pretty well got it figured out now - which is not bad considering I've only been playing for 30 years! I can tune up my drums in no time, snares included, and get consistent results.
You can tune bottom head tighter if you want that sound but it isn't as easy as tuning both heads the same. If you're going to do different tensions like that, then you have be careful to pick an interval between them that works.