Battle Born only recommends a 50 amp charge rate. In full sun with a light load on the inverter, this could be stressing the batteries a bit. Most LiFePo4 cells don't like much more than 0.5C charge rates. They can take up to 100 amps for a short time, but you may want to dial down the charge controller for long life. On the flip side, if you always have at least 200 watts of load, then it is not a problem, but something to keep in mind.
I also agree, there are much cheaper batteries than Battle Born, but they are well made with good support. So you need to decide where to spend your money. Also keep in mind to buy matched pairs when running them in series. The internal BMS in those batteries can only balance across the 4 cell groups inside. If the capacities differ, one 12 volt bank could hit high or low limit before the other. Victron and others do make balancer units to balance 12 volt batteries in series. It is not a bad idea for a setup like this. If you go the discrete LFP cells route, use an 8S BMS to balance across the whole bank.