Me too. Same issues.
I am spoiled because I have no choke on my XP and had to fine tune it to a point where it starts IMMEDIATELY regardless of cold or hot, or weather conditions.
I guess I need to do the same with the Challenger.
Challenger always starts, but it is a bit slow at times. Maybe I need to try it without the choke, but when it is warm, and doesn't immediately fire up, I automatically hit the choke a bit. Just a bad habit, I guess.