Ok I got the casting bug

I posted this b4:
How far can you cat without hauling
I learnt to double haul. It makes all the difference. I tried to learn it for months and months and all of a sudden it just clicked. I dont know if i am doing it well but I'm definetely doing it. I haul now without even thinking.
I really enjoy the casting and find it a challenge to cast a line further than i have before.
I have been measuring all my casts.
I am using a 7 weight Cortland Big Sky as well now and can regularly get around 95ft, have had 101 ft. With the 5 weight I am getting 80 odd feet (cant remember exactly as I use the 7 weight almost exclusively now) all measurements from tip of rod to end of fly line no leader included.
I have noticed that the fly line makes HELL of a difference. My 5 weight (vision attack rod) has a vision attack line and my 7 weight has a partridge line and the partridge line 'wants' to go through the rings while the vision does not.
Anyway, my questions are:
(1) How much extra distance would a faster action rod potentially give me? Are my current distances good or could I be doing better? as I seem to have maxed out?
(2) A lot of time when I cast as far as I can the last couple of meters of fly line lands at right angles to the rest of the fly line or sometimes even ends up almost facing back toward me. Why?