First, if your going peltasta, I’m going to assume you don’t want the most amount of DPS as the class offers tanking capabilities, 100 crit is minimal and you probably won’t have much to begin with. It’s crit chance which means you’d need a LOT of DEX to have a decent crit chance to begin with. If you want to crit, High Guard is not the skill for you.
Second 240 block is a decent chunk in addition to % block scaling buffs like Finestra and peltasta attributes that add % block and % defense, especially when guarding. I can agree it can certainly be a little higher but not by much.
Guardian does add a fairly low chunk of defense but also offers evasion through an attribute and again, even that small bit of defense adds up due to % scaling attributes/buffs. I can agree that buffing it a little bit would make me want to pick it up more.
Back to the OP, crossguard most definitely does not need to be tweaked in comparison to Peltastas. I see plenty if not more Peltastas around instead of highlanders, and crossguard is almost never used due to it being a few seconds of guarding most useful only in PvP and every now and again in PvE and even then it can’t even be remotely compared to the block that can be achieved by shield wielding Peltastas.
As for the most optimal method of tanking, if all you want to do is be a meat shield holding down the guard key 24/7 in dungeons, and almost absolutely useless outside of dungeons then yes, that route is the way to go. But by no means is that the optimal method of tanking. An optimal method of tanking would be a build that:
- Can hold aggro.
- Can take a minimal amount of damage while dealing he maximum amount of damage it can.
- Usually offer as much CC as possible while still being able to take minimal damage.
The build you posted offers maximum damage reduction and can hold aggro on 10 targets, but by no means is it remotely optimal. Similar to full support clerics, they are not necessary with the current content and far from optimal.