Comparing the 13'4" Solstice to the 1307 would be a much more valid comparision then the 1307 versus the 14'3".
I have loved the 1307 since the first day I fished it but after spending the day with 13'4", I must say I like the Solstice a tad better.
The Solstice is light, seems to be a tad more responsive and has a more even even flex pattern. I believe the 1307 has a bit more punch in the tip however.
If you are after a light, quick but progressive rod that generates a whole lot of line speed without losing any finesse, the Solstice would be your choice. If I were fishing a shorter head with tips, I would lean towards the Custom as it seems to have more oomph in the upper half the rod.
Another thing to consider as well, the Solstice is spun from CND's IM8 absolutely bulletproof graphite...a graphite that also recovers amazingly quick. The Custom is spun from IM7 which is a great light, responsive graphite, however it is not nearly as durable as the IM8.