For the NightCap I would recommend the Wilcox L4 G22E over the G11 or any other Force-To-Overcome (FTO) mount.
Not only does the G22E have greater forward adjustment that is useful with the NightCap, but IMHO, push-button mounts simply play far better with the NightCap than FTO systems. Because the NightCap is non-rigid, applying force to the mount to stow the NVG will almost always cause the NightCap itself to shift. With a push-button mount, the folding arm will offer essentially zero resistance while stowing as long as the lock is released. That being said, the G22E will require you to also purchase a dovetail adapter, rather than being able to use the USGI bayonet interface and J-Arm that most likely came with the PVS-14.
Also, the NightCap is extremely popular because it is light and relatively cheap, however it's worth noting that because it's a non-rigid system, it's not as quick to don or doff compared to something like the Ops-Core FAST Bump. Comfort, of course, is relative--however, one thing to consider is that because a helmet is much easier to simply take off and put back on, the NightCap could end up ultimately meaning more neck strain and heat retention over the long run. This obviously doesn't mean much if you're only going out for an hour or two, but over longer durations, being able to periodically remove your headgear might be something worth considering if covert packability is not a major concern.
~Augee