I’ve no problem printing with the enclosure closed. The chamber gets to about 40ºC and no higher for me, so perhaps that’s what’s helping? I’m also using the Textured PEI plate, which sets bed temperature at 55ºC.
So, yeah, this is a “good for me” post, but I still find those useful when I see them as it tells me that it’s not a consistent issue. Hope this helps nevertheless.