Difficulty inconsistency in Rampage.

So, I love the new Rampage mode, and I've basically played it exclusively since it was added.

However.

There is such a wild shift in difficulty between runs of it that it's absolutely nuts!

On a run last night, I made it to ~580 tons wrecked, personal best! Yay!

This last run I didn't even make 200 tons, and it wasn't for lack of viable add-ons or upgrades, (skullbuster, overdrives, gyronaught, etc. Even the Zeus-thing cockpit add-on. All very good), but more because I faced an early wave that ended with 2 Jacks and 3 Alphadogs, then began the next wave with 3 Bloodhounds and 2 Alphadogs, then 2 more Jacks!

WTF!?!?

How the hell does that work!? That's both a shift in base difficulty (the opening waves this run were Roachads, then Turtles) and a WILD shift in difficulty ramp, going from "doable if careful" to "I literally don't have the time to stop running" in 2 waves.

I have no idea if this is an intentional feature, or I'm just awful at the game, but it takes me right out of the game to do so well one run, then get shredded like an amateur the next.