What do you recommend instead? In my opinion the Razer mice are always superior for FPS.

Logitech all the way.

Logitech is a truly innovative company. They actually care deeply about ergonomics. They also introduced the first mass market application of programmable magnets (in the MX Master mouse scroll wheel) - that's incredibly advanced materials science.

Some Razer mice were somewhat good in the times when the sensor mattered, with the rest of them being absolute garbage (starting with the Copperhead which barely worked). Today there's a ton of niche manufacturers with great internals that will exceed any requirements you might possibly have.

If you're really interested in FPS performance and not just the brand, choose for the ergonomics first, it's not possible to recommend anything without knowing your play style, hand size etc. The shape and weight you like, and complementary feet and mat with the exact static/dynamic friction you need. Then check if the internals are good enough (they likely are) and whether there are any firmware issues like extra jitter on flicks or unavoidable debounce lag, then look at the required software. There's a ton of mice with excellent performance that are configurable without ANY software.

Logitech have always made great gaming mice in my experience, at a reasonable price

I know hardly anything about FPS but the reason I like Razer mice is the hardware macros. Configuration profiles are saved to the device and macros are performed at the hardware level. Some actions work with the razer software but most of them don't have to.