I tried to calculate the payment from the coming week and I thought it would decrease from before even though there were bonuses offered but the Perpost fee was reduced. are my thoughts and calculations wrong?
You are right!
For example, for your rank, in Tier C, new rates are just 50% of previous rates; and manager confirmed about the lower rates, in BitVest's bounty thread.
As per lightlords post we are lowering the rates for the upcoming weeks, so from now on you'll get those new rates.