Perhaps this is an unpopular opinion but I think we need more testers that are on the lower side of the rating spectrum. Having only red/orange testers for Div 2 contests might (and does) result in underestimation of the difficulty of the proposed problems. Blue/cyan or even green/gray form a more representative sample for the actual contestants. I understand that there should be a few highly rated and experienced testers but having only them can result in speedforces rounds for Div 2 participants.