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2014 Silverado 1500 4.3 DI misfire

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2014 Silverado 1500 2wd 4.3l DI. 150,000 miles. Fleet vehicle with decos oil changes every 4,000 miles. Came in with a misfire. Counters showed cyl 1. Replaced plugs and wires (Delco). No change. Looked at injector balance and seemed to have a bad #1 injector. Replaced 1,3, and 5 injectors (delco) and the 2 stainless under manifold fuel lines. No change. Removed 1 and 3 plugs compression seemed very low on cyl 1. Performed induction service (BG). No change. Re-performed compression test. Much better 210 psi but still running like crap. Pulled left valve cover and removed #1 cyl rockers to close valves. Performed leakdown test.  Only 5% leak at 100 psi. Help?!?

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