Experience exchange and cost accounting about equipment smashing
Let's talk about the success rate first~
This success rate basically depends on how you control it~
Regarding the use of "padding items", everyone should know about it, I won't elaborate. Just note that--using padding items only once is not very safe.
Personally, I think if it fails before +7, then so be it, the loss is small. Failing a few more times can actually be beneficial for later stages~~~~ The key points are +7, +8, +9...
My personal feeling is