Nice tips. Some more:
Something that you aren't including in your calculation is bandwidth. Your bandwidth is limited and grows as your SP grows. The more you comment, follow or resteem, the more you eat into bandwidth, which is a good thing, as it limits spammy behaviour. I have followed new people who looked interesting but then had to unfollow them as they clogged my feed with endless posts, memes and resteeems. Don't do it. Check your available bandwidth and voting power at steemd.com
Post once or twice a day and limit your resteems. Make it count.
Vote 10 times a day at most.
Don't go and link your post in the comments on other people's posts, it's annoying and guaranteed to get you ignored. You may get away with it if your post is related but you can earn yourself a flag doing shit like that too often.

People with voting power will upvote your comments and it will earn you something, if they consider your comments interesting. Have the manners to upvote a post before you comment: even if it's not worth much, it is appreciated. Minnow votes, views and meaningful comments are every bit as valuable as the $$ votes that the bigger fish can give. Commenting everywhere in the hope of earning a bit but never upvoting the posts that you comment will get you a nuisance tag in many people's minds.
From the incomparable Hive account@meesterboom: