Question about Arcane Strike

I know it's probably not a very good DPS skill, but what I am after is the AMPR Buff. It's like Trigger slash but for SubMD
So question:

How does the skill level affect the AMPR Buff?

Side Question:
How does the skill as DPS work?
What's the Skill Power and Multiplier from the MP Used?
Also, How does this scale with Skill level?

 

Regarding the AMPR: +10 (Lv. 1-5), +20 (Lv- 6-10)

Regarding the side questions:
1: It's really bad. Assassin Stab outdamages it by quite a bit and doesn't consume your whole MP bar...
2&3: Skill constant:500+50*skill lvl
Skill multiplier:0.1*skill lvl+(0.6+0.04*skill lvl)*(MP/100){this MP is from MP bar only}

If you wanna use arcane strike for the ampr you can just use it as a combo ender with a save tag. It consumes 0 MP then

 

Ooooohhh so Level 6 should do good then
Yup, I use it as save tag.
Even back then I used it as an ender for my decoy combo. AMPR was so good

Im gonna use it as my "Trigger Slash"
It seems to do me more AMPR than a 10second Kairiki