Summoner as a subclass requires a lot of upkeep since you need to be constantly apply Summoner's Mark to get the most out of your damage, but if it is what you want to run with, I just have a few things to add since you have 24 SP still available for your build: take the full 5 SP into Pet Elemental Precision Hit (it gives you an extra 5% damage when you are matching Element, which you will be doing with Jet Boots), the full 10 SP into HP Mega Up, and the other 9 SP into HP Restorate. Other than that, you pretty much got all the Skills that you would be using for a Summoner subclass.