I also have these three parallels (all #'d) in addition to the Yellow printing plate I got in a trade with Dodger Penguin a while back.
Well, I thought I was close to a rainbow anyways. I double checked the checklist and found that I will still need the x-fractor, green, gold #'d/50, black #'d /15, yellow #'d /10, and red #'d /5. So six cards are still on the chopping block and a few of them will be pretty difficult to find, not to mention pricey. I won't be losing any sleep if I don't get any closer to the rainbow.
Luckily for me, the seller of the pink refractor decided to toss in an extra Kemp that I didn't already have. With the addition of both cards, my Matt Kemp PC now stands at 158 unique cards.