Good Morning -
First off, the judging is going to vary from State to State, so take advice appropriately.
My daughter recently finished her first L6 season and I can say without doubt that yes the judging was harder. I will characterize it this way - it appears that they are trying to sort the wheat from the chaff; the serious from the not-so serious. The judging was much more critical of the little things that make a big difference in the next level and beyond. In other words, I think they are trying to get the girls to focus on things that will make them successful in L7 and beyond.
Once the girls figure this out you will see a steady progression thru the season. Bars: body form is critical; free hip to 30 degrees above horizontal is critical; tap swings are critical; connections (no pauses); casts at 30 degrees above horizontal or more. Beam: body form is critical; back walk over will
kill if not done correctly; dismount will also hurt the score if there is no pause between the two handstands. Vault: amplitude, tight body, punch off the table are all key. Floor: everything needs to be landed with proper form - no reaching for the floor; dance passes need to be proper form; front tuck and back tuck - no steps after.
Hope this helps and good luck!