Talk:Prototype Keiun (Carrier-based Reconnaissance Model)/@comment-30162671-20190817170724/@comment-110.54.192.166-20190817182626

IIRC upgrading to +5 has an almost, if not guaranteed, success. I have never heard of a failed +1 to +5 upgrade.

Failures start to occur (for me) at +6, I think I failed at least twice in my entire improvement history.

Ah, the improvement arsenal page actually has a table. There, +1 to +5 are guaranteed success without slider so no need to use it.