Patience is key for sure, but you are getting to 3.4V barrier! The charge curve is nearly flat until you hit 3.4 then things will progress quickly from there. The finish line is in view! ?
I don’t have any experience with them, but am very curious. The only potential negative I can see is the lack of temp sensors. This seems to be a nice option and great bang for your buck for those looking for relatively small capacity for an RV or van but don’t want to DIY the battery.