My HF2 is super picky about the knots. I don't mind changing strings on a tie bridge or pull through bridge, but the HF2 can be a battle. So, I leave myself notes in the case. What type of knot & how many on which string, using what type of string. I still hate changing the strings on the HF2, but at least I don't have to rely on my memory on how to best change those strings.
This is the one thing that keeps me from playing my HF-2 more. I absolutely HATE the slot bridge on it. Everything else is wonderful. I even enjoy changing strings on my instruments, but not that slot bridge.
I wish that Kamaka made a concert scale with a tie bridge...