Hi yabapmatt!
Sorry for the late reply but thank you for both the upvote and the honest advice about actively using my SP! An upvote like yours makes a massive difference to a new account. I've written previously about how I think it can be hard on new joiners who don't have any money for SP, as their upvotes can't even generate $0.01 of value on posts.
Anyway I will continue to actively use my SP, but like you say if for some reason I'm not able to post for a while, delegation is an excellent option for me.
So is it simply the case of delegating to PP, and then the software is clever enough to figure out what proportion of rewards I will receive and automatically transfers them over periodically?
What a time to be alive!