Whats your barrel length, twist rate and have you tried going up on your powder charge with the 168 Hybrid to hit the next accuracy node? I shoot the 185 and 200 hybrid at 600 and 1000 yard matches with good results but have a few friends that use the 168 hybrids with good results also. We are running them quite a bit faster than you are though.I have been shooting the 168 Hybrid for 500 and 600 yrd. F-TR Class and that bullet is just really accurate. My best string at 500 so far is a 199-10X out of 200 and believe it or not my last shot was a 9 ( nerves got to me ). I went to the Ballistic seminar put on by Brian Litz the day before the 600yrd mid range match at the Berger South West Long Range Nationals in Feb. at Ben Avery. It was also a range testing day which I thought was going to be at 600 yrds, but to my surprise it was at WHAT!!! a 1000yrds. I said I wasn't set up to shoot that far and asked Brian what he thought. He said with my load, 43 grs of Varget at 2750 fps I should be OK.
From my 500 yrd Zero I dialed in 22.5 MOA and was 8 in high and about 12 inches to the left. After I got sighted in I ran 20 just for practice and shot a 170 out of 200 and my target puller said they all made round holes in the target.
But most of the guys are shooting the 185 gr Hybrids for a 1000 yrds, so I bought some but haven't got to do any testing yet.