Anybody have any clue why this last piece I bought provides such resiny hits?

Yeah so I don't know what the deal is. At first I thought for some reason the slide for my bongs had been caking up with resin realllllly quickly. I'll clean it out completely, and by the second or third bowl the hits are disgusting, almost impossible to hit. and this is WITH A CARBON FILTER.

I'm thinking it might not be the bowl, but perhaps the mouthpiece on the wubbler? It has a bent neck and flared mouth piece which creates a kind of funnel of smoke of sorts. Every time I hit the piece I always end up with a bunch of brown resin on my lips. Never happens with traditional bongs with straight tube mouth pieces.

Here's the piece for those wondering: http://aqualabtechnologies.com/scientific-glass/manifest-glassworks/manifest-small-circ-perc-bubbler-platinum.html

There's always the option that I'm just overthinking all this shit when I'm baked and it hits just like any other piece. Maybe I'm used to my friends nicer bongs. I dunno. Open to suggestions. Thanks.