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I have had similar issues with the P1298 on an injector buzz test. It only will show up on a buzz test. The truck seems to run OK, however gets only 16 MPG on 33" tires, My other truck not exhibiting the condition gets 20 MPG. At the time I found the code, I found that my driver's side wiring harness had a short on the #4 glow plug so I changed that UVC setup on that side, put it back together and the glow plug issue was gone but not the P1298. Did you ever swap out the other side harness and have any luck. I have been researching as well and found that on some IDM's ford had issues with them, specifically with production codes OEO5 and OEO26.
Keep me posted and I will do the same for you. My truck doing this is a 2003 (10/2002) F350 7.3L Crew cab Auto 4x4.
Differences in my scenario are that I don't think I've been getting the hesitation, and I have never not had my injectors buzz for the test. I believe on that truck I have had the #8 injector come back low on the power balance test.
Steve in Central CA
'03 F350 CCSB FX4 w/ 7.3L & 4R100, Factory Tech Valve Body, DP Tuner, AIS Intake, & Banks 4" Monster Exhaust 232K MI
'02 F350 SCSB 4x4 OFF Road w/ 7.3 & 6 speed - DP Tuner, AIS Intake, MBRP 4", F650 Dash Mod, AirLift w/ OBA, 223K MI
'97 F350 CCLB 4x4 7.3 & 5spd. 3-3.5" exh, wayne hanson bumper w/ 12k winch, Nelson rear bumper, Gooseneck, 410K