100% this. Long ago, I had a guy from the R31 club who set my BNR32 up (adjustable arms all round). He did an awesome job, was an after-work kinda thing where I had to bring a slab of beer. My car never drove better, and I stupidly got a random tyre shop to check the toe angles when I changed tyres, and they ruined the alignment.
tl:dr- it takes a lot of skill to set up your car lowered from factory properly, and is worth paying the $200+ it takes.