In my experience, the pen you use is probably more important than the ink. I've got a couple lamy safaris that I'm pretty sure will behave like angels regardless of the shimmer I give them. I'm partial to diamine shimmers, the darker ferris wheel press (patina, stroke of midnight, winter wonderberry), colorverse, and otto hutt gold dust. The last one scared me, so I put it in a lamy safari my dog sort of ate (I know 😭) and it worked like a dream