Lets face it, that wind isn't helping #1, but definitely can improve in consistency of toss and to me that looks like where balls end up in the net or long. I think #2 is fine, but can improve pushing up into the ball for #3 for more power and kick/spin.Currently:
Seemingly i've just got a proper ESR racquet drop for the first time, mostly I think from the Salzy from tennis evolution tip of a "good first move - keep palm down". BTW sometimes my racquet hand cramps when i serve now. Is there something im doing technically wrong to cause this?
I'm trying to:
1. Toss accurately
2. Good first move (trying to keep palm down / ESR active)
3. Rise into contact
What should I work on next? I notice my motion isn't very smooth, i seem to pause at trophy a bit. I also seem to fall to the right too much perhaps? Not sure what else is wrong, but i dont seem to be getting massive power.
Overall you are doing what you do well and could keep adding in reps with tweaks in your #1 and #3 to see improvements.
Hard to really tell in the video, but one of my first reactions watching was that your arm/wrist/hand/racquet positioning looked stiff, and needs to loosen up, ala Djo kinda thing. Then I saw your comment, so maybe that is why you have hand cramps. I'll see if I can find one of the Djo videos where you can see how loose and relaxed his arm down to the racquet remains, which also adds pop and power.
EDIT: Can find the one I was thinking of where is was warming up serves and was letting his wrist relax and the racquet just dangle, but here you can see it a bit. This is older, but still similar to his current service motion.