Alot of the mining spots in f2p are crowded.
What Ross said should be good, put your 'bot aggressiveness' to 10 so it can try to beat the other botters.
I'm 62 mining right now using KMiner, currently mining at the guild. I'm making like, 14k xp per hour at the moment. Not the best, but I mean, when it starts to pick up as my skill gets higher we'll see if I move from here to elsewhere.