My own thoughts - though OMC's are really good, I really have a tendency to think it out a bit differently.
First to go is R3808 due to the shape of the stone. Beautiful stone, but you mentioned you love the cut corners being accentuated... well this stone needs bigger cut corners IMO for that style.
Next to go is R4149 for similar reasons. Not quite square enough and not quite bold enough IMO. I love the color though, but just not what I would pick.
The next is harder for me... R4614 and R4234 are both very very beautiful stones. I love them both equally and for totally emotional reasons. That said R4234 has the slight edge to me in a way.
Simply looking at photos of the loose stone in the ring you loved next to each stone sold it for me. The shape of R4234 is closer to what the ring had - bold cut corners that will look fantastic in that kind of a setting. R4614 is a more vibrant color, yes, but it lacks some of the boldness in the corners that I think would be essential to the ring.
This side by side is what got me
No it isn't a Fancy Yellow diamond, but I can guarantee that the FLY would look really yellow set. That said I think R4614 is amazing as well. The color is vibrant and the cut is also fantastic! You really can't go wrong with either.
You did say that color was your priority but I do sense a little bit of worry with the ring size... however if you look at the dimensions both are pretty equal in size so really don't let that be what makes you pick.
Like I said my choice is based on cut and shape of stone and how it would look in the ring. I think R4234 fits better but R4614 is great too!
I do agree with what DAF said. If you are concerned about size, a double bezel or the like could make it bigger looking too. I still can't get over how huge a double bezel looks on my hand. Though I really do like the clean lines of the single bezel.