You're welcome!
It's difficult to know for certain about your finger placement issue without a picture or video. Yes, it's possible your Squier neck has too narrow string spacing. I have a few Strats & Squiers all with slightly different string spacing. Some are narrow enough that I also can't quite get certain open string chord voicings to all ring. But the same voicings are easy on a different guitar with wider string spacing!
An easy way to check that isto try other guitars that you know have wider string spacing. Some electrics, most acoustics & classicals. A visit to a local music store to ask about this & play a few guitars would also give you more information.
I have 2 tutorials designed to help improve strength & dexterity.
Trill Drills is a series of exercises that focus on all fretting fingers.
https://www.guitartricks.com/tutorial/1829
Building Pinky Strength & Dexterity is a series of exercises focusing on your pinky.
https://www.guitartricks.com/tutorial/1292
Hope that helps!
Your tip on checking on another guitar worked for me, because on my acoustic guitar, with more space between the strings, I had same issue. So after that, and checking a basic tutorial of Caren Armstrong (The Basic Chords: Position and Placement), I found out my nails on my left hand were a little little little bit too long :-), I couldn't see/feel it at first. And now I can play these open chords as well without demping other strings.
