Hi.
I make this short and crisp 
Yes. That’s the problem with “auto scale” from big to small.
Yes, you have to do that. And check the settings for the devices. Very often these settings are used:
extra wide: n.a.
1200 px: auto
960 px: custom
768 px: auto
480 px: n.a.
320 px: custom
And i highly recommend to watch this video:
Making a page responsive.
Mr. F.