Not sure if converting is a mistake - I think HIVE will be worth more than the 20% interest gain per year.
I think I have only written one SL battle post - but yes, they are good if there is more in it than just the battle itself. I like when people add some personality :)
I think that many of your splinterlands posts could qualify for social media challenge. you would probably only have to share them on twitter or facebook and your posts would be eligble for splinterlands upvotes.
I don't worry about the SL upvotes. If they like the posts, fine :)