what's funnier is that the Indian tech group (or at least Hindu's there) get decisions to reduce tech costs. Add in Innovation and you're flying past the Muslim tech group.
In my Vijay game, no colonizing, I was tied with Castile and Portugal at military tech 15 when I met them. Yeah, they had an idea each that I didn't have, but otherwise on the core tech, I was similar.
For the OP's point -- yes westernization in Mali is happening way too fast, even for the AI.
Personally, I'd like to see a minimum admin tech 10 requirement for it. Mali still might be first (due to how the AI and players tend to colonize) but at least it won't be at the beginning of the game. -- though, get rid of the silliness of 2 idea groups required for the nomads to westernize. Or force everyone to have the same ones.
Natives get to 'reform' and get a big tech jump, not to mention a lot of unit types. They really should add more for the tech groups (including nomads) that have big gaps in them. The unit types for the natives has always been there, even before the DLC.
2ndarily, double the westernization time. It should take a long time and not be a 'must do it early' thing. either bump up the monarch points needed, or cut down the monarch points taken per month (or both). Not everything should 'stop' while westernizing, so I definitely prefer the lower MP/month soaking so that you can still spend points on buildings/etc.
oh, and ofc get rid of the monarch points lost per month garbage for lower tech groups. Increase building monarch point costs, increase the tech costs, etc etc. You shouldn't need to westernize to enjoy a game as a lower tech group nation. Ofc, you should expect to WC without westernizing either (or standing up to europe).