I am writing to report that the newest edition of crossover, 24.0, has brought significant performance improvements to AOM EE. The stutter has been completely eliminated making single player run perfectly. Unfortunately I was experiencing significant lag on multiplayer which was better than the previous performance with the stutter, but not good enough for competitive play.
I tried both D3DMetal, and DXVK, but DXVK only offered marginal improvement over D3DMetal, neither were good enough for competitive online play. Looking forward to further improvements though as the performance has improved significantly since the last time I tried, leaving me with hope.