Yes, I agree that a busbar would be a better option. However, I have monitored the temperature at the connectors under max load (8kW) and it's acceptable.
I'm not sure how to track that using the SOLARMAN app that I'm using. I estimate there are 2 charge/discharge cycles per day, or 60 per month. So on the oldest batteries, that have been in since May, or 7 months, it'll be around 420 cycles.
I don't use an app specifically for the SHOTO batteries. I use the SOLRMAN app for the inverter and it's got some basic BMS info, but I haven't needed to investigate any issues with the batteries, so I haven't bothered trying to find an app for them yet.