196kg is max carry weight with pack rat, strong back and 10 strenght.
Check my second crafter
124 Base CW + 22 strong back = 144 CW
144/4(25%) x 5(125%) = 180
144/3(33.3%) x 4(133.3%) = 192
Conclusion; is more increase than 33%
At 33.3% the starting value would have to be 147 CW
At 25% the starting value would have to be 156.8 CW
At 35% the finishing value would be 195.84 CW