It's not that wide, You will find many good regs open 16-20% range I believe
I think ATo,KJo is a bit loose, and the range lacks some SC's imo

Yup, I dont open KJo tho, but open more suited connectors, A10o depending on table

almost - except ATo. might open 89s,78s,67s,65s as well pending on table and if blinds are nitty / never 3betting

Seems about right.

If you want to tighten up, fold hands that contain a 2 or 3 in them. You want your opponents to have those cards and fold to your raise.

So may be get rid of A2s, A3s and add 98s.

Keep in mind that the Snowie ranges are based on a half pot raise (2.25x). If you open larger (3x is normal in many games), you should open tighter.

People suggesting more suited connectors are going to run into a lot of reverse implied odds when OOP opening into 5 villians. Pretty sure thats with 87s and worse and all folds.

I would think anything between 14% to 20% is reasonable depending on skill/comfortability and player pool tendencies. I would want to know how often I am getting 3b and how often I am getting called by players IP on me. Once I had a feel for that, I would adjust accordingly. I think Peter Clarke suggests something like 14% in his FTGU course here.

If you are using the Snowie Mobile App, I think you can adjust the open size if I am not mistaken.

Basically PokerSnowie open ranges are pretty good.

If your really uncomfortable with PokerSnowie suggested range then I would suggest to loose the for you most uncomfortable ones or just try them for like 50% of the time.