Ultimately I am running into range issues for the dives I want to do even with the 20Ah batteries in my Blacktips. I just want a more reliable scooter with more thrust and a larger battery. The Blacktips have served me well and I am big fan / proponent of them for their price range. It may seem like I am disparaging them but they are great DPvs.
I think a lot of people fail to see what the Blacktip is, a value scooter. They made compromises in the design to hit the desired price point and with features that favor the original travel market that it was designed for. And this scooter likely also had to make compromises to hit the desired price point. There is a reason why DPVs are so expensive and it sure ain't profit in this niche industry.
I haven't gotten mine wet yet, because I want experience before I start scooting the first thousand feet, and find myself up to 2,000 ft away from the exit. But ultimately I know it has limitations, and at some point I will need a second scooter and that would best be a longer range expedition grade scooter. But the nice thing about these quality but still value scooters is that when you finally drop $8k on an expedition grade scooter, you can use the value scooter as you back up scooter.