There are certain risks and disadvantages when playing with PIG + pers. First is the risk of not hitting with PIG: if you miss a pig shot you will most probably die before you can reload and try again. Second, pig has limited range, that means that if you are playing, for example, with o-pgl or osmaw you won't have a weapon for mid-range (e. g. opponent is higher than you). Third is that you can't blow up enemy vehicles as easily with percs. My opinion is that this combo is "rewarding" (for skill).
How to counter it: stay more than 10m away from your opponent, he will have trouble hitting you with PIG, play unpredictably, for example, all-in rush, if you can deal 600 damage to your opponent quickly, he will kill himself with his perc.
To my mind, Yukon needs to be nerfed first, you don't see every enforcer running around with this combo.
Also, tell me your in-game name