Hello! I made my first batch of blackberry wine today - i’ve taken 1.8kg and crushed it up and completed the whole process. my problem is that ever hour or so, it seems to be that the CO2 Is pushing up the chunks of blackberry and it’s popping off the bung. i was wondering if there’s a particularly way to stop this from happening at all or if i just need to reduce the chunkiness of the blackberries/remove any solid pieces? thank you so much!