In your second photo, I would remove the one labeled “G”. Can’t tell what’s going on in the first photo.
Timing is debatable. Pick a way and observe how it works for you.
Some argue to let them all grow and thin them out in the fall because it helps keep the new growth balanced (stronger branches send more shoots, but they can be smaller, so you’re ultimately restoring balance later). Boon’s students are in this camp, I believe, and don’t report coarseness in the tips.
Others argue it’s best to reduce them down to a pair as early as you can identify them to avoid coarseness at the tips. You do risk allowing strong shoots to divert all that energy to a single pair of shoots. Then, just shorten the occasional too-strong shoots when they look like your 2nd photo.
Once you’re getting to this level of detail, you are probably paying close enough attention to intervene before any adverse effects appear from leaving too many clustered on one terminal.