Title: Merging Valks Advice to higher grades
Family Name: elennaiur
Region (NA/EU): na
You cannot increase infinitely, maximum is a 90% chance of success.
Also even 1000 stack it's still a ridiculously small amount. What is the chance of a black star pen at 300 FS? 5%?
Stacking Advice of Valks is a good idea, of course, but it can't have any limit.
Conclusion: if I have 100 FS or 400 FS it is still the same, the chance of success is ZERO.