To get some put information right.
The previous unaimed criticals had 2-3x multiplier. Now they have 1,5-2x multiplier.
Also about the chances in bypasses on unaimed shots depending on luck
(note: the Guy in CA does not have Man of Steel):
So with LK6 you have aprox 12% chance to experience unaimed bypass when critically hit in CA and attacker has Better Crits. That makes around 3% chance to get bypass critical and 22% chance for normal crit if attacker has 25% critchance. (also on next update bypasses should be visible in log even on lethal criticals, so it will be sure if the hit was bypass or not)
Imho the primary reasons that among the BG(lasor gatling) builds the crit build is most viable choice right now is:
1) on first three perks the reasonable choices are Toughnesses(which give protection only against normal damage type), Weapon Handling and Critical perks (which give a chance to drastically increase damage even to the Toughness chars).
2) The fact that there are no luck requirements on toughness (nor BRD) which created a delusion that luck is dump stat for tanks and thus LK1 chars are easily killed by the critbursters.
3) No inteligence requirements for BROF thus both tanks and damage dealers have 2 or 3 int and lots of spare points to give into luck or other stats.
In the end when creating an anti-critburster tank you end up with high luck and toughnesses... so you can just replace toughnesses with the critical perks and have crit burster instead, because you have protection against bypasses with your high luck.
Imho one of the simpliest solutions to the problem is either make different crittable for critical bursts and singleshot unaimed and alter multipliers or bypass chances, the Jovanka's suggestion with partial bypass, or maybe both.