My friend was LVL 52 Pure STR Lighting Glaive. He was lightning because he thought it was faster to level up with the grasswalk. The thing is, he's been leveling with a 7 gap and he's got tons of SP, I think over 160K now. Then he made the switch to Fire and now he's been leveling way ****ing fast even with the fire because not only he has a strong imbue + the buffs and he has grasswalk Speed with garms. He's close to lvl 57 now.
Do you guys recommend leveling up with lightning then switch to fire at the end or near it?
Pure STR Lightning Glavie?
Pure STR Lightning Glavie?
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To me it depends on when you want to SP farm. If you SP farm when you lvl 16 you will have enough sp to get both masteries. IMO Fire imbue is the best you can get damage wise and so it helps you level fast. Grass walk helps get to the mobs much faster which cuts down leveling time but you dont need it maxed out. Im level 58 with Lightning at level 40 and my fire at 58. I run at 47% and for now thats fine. When I think I am to slow I will level it up more 
Hope that helps.
Hope that helps.