Can't see the damage on the plastic plate.
Don't mean to state the obvious but could you not ask Tim at Ribeye (QC rep on shop floor) as he is very helpful and knowledgeable for engine plate advice?
Also speak to Tim reference Ribeyes new engine height and prop recommendations for the 650s and 150 Yammie set up. Last time I spoke to him they had done some more testing with Yamaha and are now recommending moving the engine height up a notch but then going down to an 18" pitch (reliance stainless steel) from the previous 19" SS that was recommended. Tim reckons it improves fuel performance, handling and too speed. Its definetly on my to do list at the end of the season
Good luck and hope you get sorted!