Steve I'm sure only VF/VBF had them , in TF58. these were the Honshu-Iwo-Bonin raids. VF45 on SAN JACINTO was in TG 58.2.1. There were still some fighters with white cowls in March for the Kyushu raids, eg. F6F #66 (VF-9), F4U #79 (VBF-83), F6F # 63 (VF-17). Apparently the VF-17 history says their Task Unit 58.1.1 had white added just before the 19 March raid on Kure.
Oddly there's a colour photo of F4U #70 from VBF-83 with what looks like a yellow nose.
But AG84 in Feb. on BUNKER HILL had yellow noses on the whole Group including VT and VB (there are colour photos).
You can check out TF58 here....
http://pacific.valka.cz/forces/index.htm
Nick