I personally like the new changes to bosses.
Before we had to do (If I didnt misscount) 47 bosses every 12 days. Whenever the day for bosses came up I felt forced sometimes to do the boss-run as it takes very long to do 47 bosses and most of the time you have to spent 2 days for the whole boss-run.
Lets say we beat all 47 bosses we would get 141 PvE coins very 12 days as we got 3 per boss before the changes. (47 x 3 = 141)
Now we get 5 PvE coins per boss, we can do 20 bosses every 7 days, so 100 PvE coins per week and 200 per 14 days.
If you do some quick math thats 10% more PvE coins than before.
And that is without considering 20 bosses per 7 days is way less stressful and the fact you can choose 40 bosses out of the 47 available ones.
Now for the money I didnt pay much attention for the last outputs but if they really nerfed those outputs by 50% like you mentioned on the Shary and Shaui boss its a huge letdown and I would support your suggestion to buff the money rewards.