Jungle Respawns too fast
There's a lot of complaining about the new Jungle and how experience gain is down but technically if you farm fast enough it's up and yada yada.
There's a critical problem I'm not sure many people have been paying attention to.
Do a full clear of your Jungle maybe even take a crab, back, and run back to your first camp all as fast as you can.
Did you notice what happened?
Reset the practice tool. Full clear, back, and pay attention to when Krugs/Gromp spawns. Specifically, pay attention to how long it's waiting for you.
That lost time is where your gold and exp is going. That's why Junglers don't seem to be able to keep up despite mathematically their scaling is up if they clear fast enough. It's because they can't clear fast enough. Or from a different point of view, Jungle Respawns too fast.