When do you feel your shoes are slippery? Is it when you are climbing on slabs, or in general when placing your foot on a hold even in an overhang?
I have a pair of shoes that feel extremely slippery, it's so bad that I have barely worn them for the past few years, they are basically new. They slip on almost every thing I try to stand on, regardless of if it's a slab or even a volume thats on a neutral flat wall. I thought maybe it was because of me not committing or trusting my feet (hence why I ask if it's only when you are climbing on slabs), but when I used my other shoes they stuck like magic.
The soles of my shoes are very smooth and hard, it feels almost like plastic in a way. I believe this is what is causing me to slip. My thought is to just send them in for either a resole (even though they are new and have no damage because I never wore them), or to get them roughened up a bit, I think there is a service for that as well.
