I'm guessing that there's really not a right answer to your question.
The Enginerd in me decided that the grease really wouldn't expand during use so I just did like you did: put some in the back of the cup, schlepped some on the bearings & inner race, then pressed it in place. You can hear the air popping out past the grease when you press the guts into place so after I put the retainging spring back in place, I packed some more in there just for good measure. The boot will keep any extra in place & hopefully allow it to flow back into the working area if needed.
No, I did not have any excess grease push out past the boot clamps & no, I can't feel the boot full of grease either. I actually tried to knead some from the boot back into the CV a few months later & couldn't tell that there was any pooled in the boot.
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