Try to change this lines ;)
...Ubisoft\Eagle Dynamics\Lock On\Config\View\view.lua
CameraViewAngleLimits[PlaneIndex.iSu_27] = {20.0, 120.0}
CameraViewAngleLimits[PlaneIndex.iSu_33] = {20.0, 120.0}
CameraViewAngleLimits[PlaneIndex.iSu_25] = {20.0, 120.0}
CameraViewAngleLimits[PlaneIndex.iSu_39] = {20.0, 120.0}
CameraViewAngleLimits[PlaneIndex.iMiG_29] = {20.0, 140.0}
CameraViewAngleLimits[PlaneIndex.iMiG_29K] = {20.0, 120.0}
CameraViewAngleLimits[PlaneIndex.iA_10] = {20.0, 120.0}
CameraViewAngleLimits[PlaneIndex.iF_15] = {20.0, 120.0}
change 120 to hmm 140 or 160 (what You like ;) ).