General

Scrolling a reverse weapon

So...recently, i made a reverse pescas using over 5/7 of my savings and it came out to be 109atk clean. even tho i like the attack, when i try to pot it it came out to be 2 lined ._. after i identify the potential, it came out to be % chance of freezing. so i cubed it a few times and it always came out %chances of something for the first line. whats going on? :O then i when i scrolled it, 3/7 60% successed. so my question is, is the higher level the weapon is, the harder it can be successfully scroll? and are reverse weapons harder to scroll with and to be cubed with good potential? cuz my past pescas is 2/7successed with 2lines 115atk max leveled D,:
P.S. I apologize for my poor grammar.