PHYTO Index II For 4a/b

I have an index I and my hair is textbook 3c/4a virgin hair.

Has anyone tried both index 1 and 2 and switched, why?

Im not sure index I will be strong enough to relax my hair.
 
I have 4a/b type hair and have tried both Indexes I&II. Index I didn't straightened my hair but Index II did after leaving it on and smoothing it in for approximately 25 minutes. With Phyto Index II my hair came out bone straight w/out any issues..
 
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