Out of curiosity, what on earth are you jumping over? And what is the height?
So my first thought, based mostly on your first, fifth and sixth pictures is NO you do not need to get your butt any farther out of the saddle. That said, with some of your other pictures I see someone who is getting a bit 'stuck', I'd like you to become a little more 'consistent' with your two point, which will help everything else fall into place. You look like you're jumping a little too far forward, bringing your center of gravity back over the center of your saddle, rather than pitched in front of your pommel will help a LOT, and then flattening your back (see the big arch there? That's a back-ache waiting to happen!) will help you get rid of that 'duck butt' sticking up in the air
Now, keeping all of that in mind, yes I would suggest shortening your stirrups to help you with the other pictures where you seem stuck in the saddle, shortening your stirrups and employing the above advice should help you become a little more consistent with a proper distance out of the saddle.
I also notice that you seem to be 'laying' on the horses neck a little, again this will be helped by bringing your center of gravity back a little bit.
As for your release... I personally think your release is quite sufficient, the jump is big enough that I like to see some contact, but not big enough that you need a HUGE release, but yes, tuck your wings in a bit and relax through your arms.