After a quick calculation (and the assumption that I do not lose any defense games…yeehah)
I saw that I need about 27 hours to get to Tier 1.
Now lets assume that some games are lost…for every 10 games I win on invade, I lose one on defense.
With the current numbers, thsat would mean I lose about half of the progress.
That means I need about 54 hours to get to Tier 1.
I think you should greatly reconsider your new PvP system as the current numbers clearily indicate at least I will lose interest immediately
(Base of calculation: per win (after a while: 4 points, 5 minutes per game…need about 1300 points if I rate the range from 600 to end of 1900 correctly) -> 325 games played equals 1625 minutes -> roughly 27 hours)