Why would you get a self tacking jib if you have no spin? If I were having trouble tacking that 5.2 I would look at my setup as there must be something wrong. My own 5.2 is only a problem if I time my tacks wrong and get pushed back by a big wave off the coast.
I'd go for roller furling first as a quick reefing option in case you get caught in a nasty down burst on that nasty little mountain lake of yours.