The average computation time per WU has risen from 13500 seconds to 22500 seconds (+67%), whereas credits have risen from 222 to 333 (+50%).

I think everybody earn the same credits amounts.

Using 333 in this period is not aleatory, it's a sign :
http://astrostyle.com/master-numbers/

Well in that case you should be at 555 since this is a new app:

Change is in the air when you see 5:55. Like a fast moving current or a gentle breeze, there is momentum to move in a new direction

BTW, at 333 the project is paying less than before. Not complaining, just pointing it out.