Red ink recs?

Fountain pen users! Please speak to me of your favorite red inks. I have a few Pilot samples, but they're all more in a magenta or orange-red direction; none of them feel quite like a true, vivid red to me. It seems like a basic color I ought to have (especially when editing a novel, where I'm marking up a print manuscript), but rather than buying a bunch of samples, I'd like to hear what other people prefer.

while I'm at it, another fountain pen question

How the hell do you use a shimmer ink in a fountain pen without it clogging up the moment you look away?

I have tried this precisely once, and the results were so bad that for the first time in my life, I purged the ink out of a pen rather than using it up. I don't know if the answer is "the pen you used is clog-prone" (Pilot Vanishing Point; I haven't had issues with non-shimmer inks) or "only ink with shimmer if you're intending to write a bunch immediately, because six hours later it will be causing problems" or "use a dip pen" or what, but it seems like other people are able to use shimmer inks more successfully. Is there something I'm missing?