I'll answer your last question first.
YES !!!!!!!!
Aim is " good enough "
You can spend the next 50 years finding improvements and never impliment it or you can start using it now.
Regarding changing SAFE at market top and bottom:
If you know when a security was at a top or bottom, first, let
Me know! Second, you would not need Aim.
The whole point of Aim is so you can invest unemotional by gradually selling and buying. If you change the parameters you are making emotional decisions and defeating the whole purpose.
Whatever parameters you pick when you set up an account, you should stay with them.
Not always
Toofuzzy
Take the road less traveled. It will make all the difference.