For the second branch of the Paladin, I don't think it should be limited to the only option for physical build, and after you choose it, means you can only use physical build, or you will lose the Paladin's soul skill Banner.
You might as well give the second branch an additional option to no longer limit the damage calculation of the banner under this branch. The maximum physical damage (base +15%) or magic damage (base + 3x%) is used as the calculated personal damage
As for shields, I think we could consider opening up the pvp damage bonus instead of limiting it to pve only. Also, as an option to increase the paladin's damage, consider adding a finishing effect to the shield. When the shield is broken, deal 2x% of the shield loss damage to enemies within 3 yards. I think this shield end damage supplement can increase the damage of the paladin without destroying the positioning of the original auxiliary tank (because it only deals damage after the shield is destroyed).