I'm not going to lecture you where to post and where not.... and to answer your question i think you should go for "HOLO LAUNCHER", it doesn't have many features but it's small in size and is stable. Although it doesn't fit in the size range you specified. Now your second question, yes, a light weight launcher would make a difference in performance but it won't be that big. So, choice is yours.
** There are no shortcuts to any place worth going **