In residential meter-main combos supply side taps are generally not feasible. If you've got a separate meter base then that's a more feasible option to explore.
If it's a meter main, the main breaker downsize is probably the best option (to 150A in this case). We do this often enough we call them MBDs. I've yet to do load calculations on an existing 200A service that came out over 150A, but your mileage may vary. On a 200A service MBD is usually (not always) my go to option over a service panel replacement, but we do those a lot, too (and I don't think we're a 'big guy' either).
Last option that hasn't been mentioned already: downsize the PV system.