Air Venturi Avenge X tuning question

I’m a long time pcp enthusiast but haven’t done much serious tuning. I have a .22 Avenger that is a dedicated bench gun and is good out to about 112 yards (in the right conditions), and just got an Avenge X in .22 as a groundhog/plinking gun. The Avenger is tuned at 1,800 regulator with approximately a 6 fps spread but I can’t get the X anywhere near that. The manual suggests a regulator setting of 2,000-2,400 for the X with a 1-2 HS. That gives me well over 900fps with 18.13’s. My understanding is that’s too fast for good stability. When I go down to 1800 on the regulator, I can’t get a good ES. Any suggestions from those with more experience than me? I want optimal accuracy with my 18.13’s. Thanks.