The damage from Rocket Jump is pretty useless, so you don't need more than 1 point in it. And saving a few mp points at the cost of added survivability/damage or a short booster is a horrible idea. It's not like pots cost anything to begin with and I recommend switching to gingers when you get like 4k hp or so, and then you won't need mp pots regardless.
And yes you will find it easy to train all the way up to 105-110, even with a crappy gun. I personally used a 100%'d maple gun all the way up to lv120 and it didn't slow me down at all until lv110. Training up till then is just too easy, all you need is a lot of drill rush and the occasional hammer for things that didn't die.
Bookmarks