Ok! So I don't know if you are like me or not - but most lotions make me feel wet and "sweaty" -- like I'm perspiring everywhere -- for a couple of days after application, even if I've showered a couple of times (!). At the same time, my skin is super dry, so if I don't use lotion, my skin has zero friction and I slide anyway. I didn't even realize I had this issue until I tried a good lotion and it gave me great grip! There is a lotion called Pole Physics that is available online, but I've not used it. I read on a thread here that Aveeno daily moisture works great, so I use that!
Also, when I'm trying something new and new extra confidence, I lightly dab iTac wherever my legs are making pole contact (along the shins, top of foot, between the knees, thighs, back of knee -- you name it!), and this REALLY helps with grip. I also dab dry hands on top of the itac when doing a cross and release. I find this totally necessary, because I get a bit (ahem) dewey between my thighs when I'm really working hard.
Good luck finding what works for you!