Foreword:- all advice below based on premise of position for shortish TT <60km
1. Test test test and test again! (in the uk time triallists are often known as testers, originally this referred to testing your self against the clock, but i think these days it is equally applicable to position and gear testing/tweaking)
2. Saddle "looks" higher than a classical fit would give, maybe by 5-10mm. I would be less clinical than most about changing this, mine is about the same and i generate more power like that (probs due to long term adaptation) it may be the case you are the same. and changing habits like that can take a fair while (i know i should change mine but cant quite bring my self to sacrifice a season to get to the same adaptation level!)
3. hand to pad position in the first image is better, hand and forearm should ideally be in a line, you are exposing more forearm to the wind in the later image.
4. If money allows, maybe a different helmet, looks like it fits your position quite well, but not quite as optimally as it could do (selector might be better). PS the concave inside of the advantage (and other helmets) in the tail, tested slower than a filled in one for me.
5.try to flatten the back out a bit, most people I've helped do field testing on have seen improvements on a flat back. It is a bit of a complicated story, but rounded back is helping the helmet air flow, and the shape is generally smoothing the air. but in my experience the increase in frontal area is a cause of net increase in drag over the flat version.
to that end, you've got to lengthen the distance between the contact points either cockpit if regulations allow it to go further forward, or maybe seat a little more rearward, if power generation can take the change? (back to more testing!) and to focus on keeping your pelvis rotated forwards further. Practice makes perfect! I can see how all this is a big commitment though.
6. I'd say pic 1 is better overall, the image shows a few signs of corroborating your experience with a slammed stem, as it looks you are on the very on the edge of what you could sustain without losing power.
pic 2 has a marginally flatter back as you say, but significantly more torso in the wind.
7. tilt your helmet back on your head a little more, looks like its impinging your vision, and get used to looking through your eyebrows, but keep your head still.
8. do the shrug! that is to say, shurg your shoulders forwards and turtle your neck a little more like this guy @0.25 https://www.youtube.com/watch?v=gQfnpp4UOX0
Very difficult to adapt to do for more than a few mins at a time but can make 10w or more difference to your drag, so worth experimenting with.
and as stated above, video of the positions at race pace intervals is much more telling than static shots, I can get into a smaller position than zabriskie static, but I cant do that in a race! + frontal image for critique.