If it comes to the hashtags and the first hashtag of the community there's nothing to consider unless you like to be muted. If you post in a community you follow the rules. You can also post in your blog and use the right hashtags to be found. It's as easy as that.

I have another tip for you. Try to write in a way people understand what you mean. I do understand to whom the contest is meant for but you did not answer my question.

You give SP but you can take it away any minute for example if you need it or leave or who knows earlier. So why SP?