I shoot the same carbon arrow/spine in all my recurves that at #50-#55 at my 28.5" draw length. I shoot 29.5" CX 4560's (same spine as 250's, 400's, 4000's by other makes) which has a spine of about .400. I use 3-4" vanes, standard insert, and 125 grain point for a finished weight of 500 grains. Adding a wrap (which I use on hunting arrows) adds about 10 grains...
It sounds to me like your draw is shorter than 28"@50# though. If so, I think you would need a 150/.500 spined arrow...