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Please do, you know I love your questions.

If your steem power is low say 100 SP you should be giving an upvote of 100% because it is just going to give the recipient $0.00 value. Now, if you have a high SP say 10,000 SP your 100% upvote will be worth say $0.32 while your 2% upvote is worth $0.01. So you will normally want to move your from 1% to 100% depending how supportive you feel about a post or comment. Whichever range you use, the receiver of your upvote gets something. Now their are people with huge steem power, their 100% can be worth more than $100 or more, their 1% upvote gives you $1. So, the bigger you get the more you shift you range of voting percentage.

Also, each 100% upvote take 2% of your voting power. If you have a lot of steem power, you spread it so that you touch as many people as you can.