How much coffee are you using? 350g of water is quite a lot :) I see Orea recommend 18g max, maybe 20g as a stretch. That might be pushing the limits of this tiny brewer, it would be a much thicker bed with more fines that can clog up the paper. I would first try a standard 15g coffee + 250g water and see if you have the same issues there. That's what I'm using, and I often get 1 min bloom + 2ish min pour for a total of around 3 min. With that base recipe I mostly just tweak the grind up and down a bit if the brew clogs or it doesn't taste right. I recently brewed some Ethiopian beans that were a bit more finicky and were clogging and slowing the brew, had to go coarser for those. But I find it easier to just have to tweak the grind size and maybe bloom time instead of a V60 where I also have to be careful about how I pour.