Well, since I am a designer I focus my 100% upvotes on design, art and illustration posts; sometimes other time of content. Also most of the comments I receive are short but meaningfull so I give a max of 10% mostly.
For introduceyourself posts it give even 1 to 10% to upvote a lot.
With this price of Steem all our upvotes are almost double value! I hope it doesn't crash too much in january.

And no matter my VP if I see a high quality post I upvote at 100%