My last 2 rebuilds aren't working out. Both are burning the wick excessively at lower watts. On first vape, it's decent. Repeated or extended vapes, & it burns almost as if the wick is drying out. I'm using the same atty, same braided silica & 32 gauge. I boiled the the silica a few months ago & no problems till now. I shove a needle down the silica & wrap the coil around it insert the wick, set coil up & go. Right now, I've only got a slight hot spot at the top leg. I'm getting good vapor & decent flavor. Any ideas?