First of all, if you don't stop leveling up your skills at some point, you're not going to have enough SP to get all the skills you want. So you should try to save up on some SP if that's what you were talking about.
As for dragon and chain spear, I do not suggest you level them any further! Dragon spear pales in comparison to other heuskal skills. Same for the chain spear. Someone just made a pretty nice guide for your build (fire and glaive) here:
http://www.silkroadforums.com/viewtopic.php?t=26105. Again, what I disagree with that thread is in that I do not think you should level your chain spear. If you absolutely are for sure you know you have enough SP to do, and you really want, go ahead. But if you're interested in using your SP efficiently, I would suggest you not add it.