Well if some1 know the answer i will like some opinions about it for good plunder grow because is really hard to get 150B ty in advance.
I'm not exactly sure on the plunder increases but to get the most stats for gold spent it's best to build your t5 to lv2 and repeat. The price per stat difference isn't huge but still better. After finishing doing a lv2 hl build go to your lv3s