One thing I have found is to use a bit that is as short as possible, and insert it fully into the chuck ... that looks like a 12” bit, and those things will wander all over, especially in #30 and #40...
KUMP - Indianapolis, IN
RV-10 N410TS bought / flying
RV-8 wings / fuse in progress ... still
1948 Cessna 170 N3949V