The concept of tiers has little meaning at this point and you should try to stop thinking of matchups in those terms. Servers are matched up by proximity of rating, not proximity of “tier”. If the tiers have ratings that are within the range of the random adjustment, they can end up fighting each other. This is going to result in blowouts, no doubt about it. However, we are not going to make changes to this after just 2 weeks of the system. There are things we can do. We will almost certainly end up adjusting the total added to each server rating to group the matchups a little more closely. First however, we need to let the ratings adjust by having more varied matchups like these. If you look at EU, which is using the exact same system, you can see matchups with numerous surprising results. The same will likely be true by the end of the NA matchup.
TL;DR: We are going to wait at least a couple more weeks before changing any of the math behind the new system, but it is very likely we’ll decrease the size of the variation at some point.