Welcome aboard! I have vision issues and so don't do tiny things any more but they can be fun and as you found addicting.
I know my vintage Pfaff is my best machine for fine and fancy fabrics, it could sew organza and batiste and silks like greased lightening -- but I never could get a quilting stitch I was happy with!
Check the basics first, like your sewing needle size and type. Your plate should be a single needle style, not a zig-zag. Past that, hopefully someone else has more experience and suggestions for you. I might try different feet, like a wider flat clear one instead of my standard 1/4" foot.
And yes, pictures please when you can!