I have a set of fire devilsticks (They arent quite flowersticks or devilsticks, not tapered at all so probably more of a flowerstick) and they really don't have much grip at all.
Both my mate and I barely use ours anymore, personally i find it frustrating compared to my normal sets. More practice would fix that.
I did get some rubber strips from a place nearby a while ago which i wound around the devilsticks which finished about 5cm from the wicks (guessing) and they never fell off, melted etc... and did seem to provide more grip. I found one of the biggest problems was the fuel running down the stick during fueling making it ultra slippery, once that gets on to your handsticks you lose nearly all grip.
Just my .02c though
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"In the end there is only fire and a waterfall"