Standard is 2 high lift & 2 low lift if you have a blade plate & use swing back blades.
4 high lift will pack the bag so full you will not be able to carry it.
I have a lot of contractors who fit 4 high lifts bcause when time = money emptying the bag 3 times comparred to emptying when you get back to the trailer makes a lot more money, even if you get a hernia lifting the bag.
The local aftermarket supplier does a thicker blade & bolt set and they are popular with the contractors but the lift is the same.
The mowers with a blade bar are pathetic when it comes to bagging compared to the disc & swing backs.