The high crit standard grants +15% chance to crit and lightning armor grants another +15%. Means if you land 4 standards against an enemy that owns your same crit stat at least 1 if not 2 are in average critical hits.

I do not understand what do you want more than this. A 100% critical standard attack? If that was implemented would have a basic damage halved in comparison with other attacks or would have a backlash so high you would prefer it didn't do it at all.

Maybe you did not notice that the only main with a secondary effect linked to critical is azure fang with neurotoxin and she owns an high crit standard only because to use it with some efficiency she needs to go together with a ninja like gakido or omoi that really do not synergies well with eventual other boosters for her.

The critical lineup you want to run exists just right now and requires you to heavily stack your main with critical and injury secondary stats. The common version runs asuma wind blade, iruka, danzo/darui/mifune. A more recent version uses madara, iruka, danzo/wb asuma and runs lightning armor, high crit standard, the passive that boosts with chakra and bloodthirsty demon.

The chance to crit is simply capped at 95%.