I had the same strategy as you.
it brought up to challenger 3.
at the moment I am still trying to figure what to do in the new system.
the rental costs are horrible at the moment, so that doesnt help as well.
to be honest, i dont understand this change and i think its really bad :(
Hi @chrz88 , wonderful for you to reply to my post! Yes, what are bummer. Finally thought I have gotten the "Secret Manual" to this game and immediately it is gone, probably this is why they introduced the update in the first place! Haha. Anyway just an update, rental prices might have gone down a little.
Do stay around my blogs a little. I will be introducing more and more things along the way, hope it will be of good help!