The trimming on the 609-PP is for elevator control horn clearance to achieve sufficient travel. The instructions for when to trim are in the "Elevator Control System" section. In my plans it is on page 8-58, second to last instruction step on the page. If you look at Dwg 78, elevator stop adjustment, you can get an idea of why you are trimming that area.
I don't know that it really buys you anything to do it now aside from simpler access. Full disclosure, I pre-trimmed mine during the HS build but I did have to fine tune it during the elevator install/adjustment so I don't think I gained anything by doing it early.
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Sam
RV-8 with the Showplanes Fastback conversion
Emp completed except for glass work
Wings completed except for bottom skin and glass work
Fuselage underway
N18451 reserved
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