I use a Loomis BCR803 glx, to fish grubs. After fishing several loomis rods both spincast and baitcast, I settled on this rod because of the "extra fast" tip rating. I can feel a leaf on my hook. I fish 1/4 oz. gama. jig heads with 4" grubs. Personally, If I was deadset on a spincast and going to exclusively fish grubs, I would try out one of the Loomis Shakey Head rods. They have the "extra fast" tip and plenty of backbone. Hope this helps.
ps-if you have a choice, buy the "GLX", it is worth it