You need more weight down low. Just add these steel wheels with your preferred tires will drastically improve crawling performance.
https://a.co/d/aOvey25
Add enough weight down low and you can manage angles like this
I've never been concerned about rotational weights on these SCX24s. All 5 of my rigs have metal wheels along with other brass components to lower the center of gravity. I've only had one motor died. However, brushed motors for these are fairly cheap $10-$15.
There is one info that is essential...