Transitions between Outside Fighting to Inside Fighting?

[BoxingDude66]

I've been rather confused when it comes to doing combinations that involve bridging the gap between Outside Fighting range to Inside Fighting range. I know this question sound very basic and rudimentary, but I'd just like conformation and advice.

For example, let's take the 1-2-3 (Jab, Cross, Left Hook). You move in with a Jab, land a shorter right, and emphasize the Left Hook at the end right? I always want to throw all three punches at their full extension, instead of shortening one up to land another one.

Another example is 1-2-3b-3 (Jab, Cross, Left Body Hook, Left Head Hook).

I always feel like with all these combinations, I want to throw the Cross that links the the Jab and Left Hook together at the end at full extension. Is this wrong, should I shorten the Cross (throw a shorter Cross) to land the Left Hook? Or should I throw a shorter punch (like an Overhand Right), instead of throwing the Cross, which is longer?

I might be majorly over thinking this, but it has left me very confused. Any advice would be greatly appreciated, thanks!