Damn so isolation work is really the only way huh.
Yeah I notice my posterior delt is smaller too, but I do bent over rows which should hit that area.
I would honestly prefer barbell exercises since the most dumbbells I have at home are 10 lbs.
You don't need a lot of weight for lateral raises, start off with the 10lbers, then if you need to just buy 20-25lbs dumbbells. I shoulder press a lot, but I don't go any higher than 25lbs for lateral raises since you can really jack up your shoulder with the wrong movement / too heavy a weight.
Well there are upright rows, though those can be hard on the shoulder.
That's what messed up my shoulder.