My dad's pretty good at astrophotography so I know a little bit about it. I saw you saying that you were taking short exposures because of star streaking? Why don't you use a tracking mount to avoid that, otherwise your noise to signal ratio is gonna be pretty stuff. Also, how many exposures are you stacking? At 1.5 sec each you'd need a lot of images to get a decent signal because the signal increases by the square root of the amount of images stacked.
Anyway, here's some of my dad's stuff.
Those look nice, but it's irritating when you don't read the thread and then make assumptions.
These last four pictures were my first time using a tracking mount... or a telescope. Read the top post on this page please.
Also, I can tell that your dad is imaging in narrowband. I don't have that ability yet. It's expensive.