Those two wrenches look good for the job & look long enough to apply decent torque to each spoke.
I have the same truing stand..
The rim is OEM? where did you source the rim ?
I ordered a rim for a 'good price' online and had a similar issue;the rim didn't 'true' when I applied even tension to each spoke.
I found the new rim was somehow 'out' even when new;it could have gotten slightly bent during loading/transit from the country of origin from being in a container & the load inside the container shifted,at some point? I don't know.
I ended up working with it until I found which spokes I could tighten that gave a good result;the majority of the spokes held that rim 'in true'..
There are a few spokes/positions on that rim which must have been the position where the rim was slightly damaged/bent 'just enough' to keep it from achieving a 100% True.
I then worked all the spokes while keeping in mind the slight 'inherent twist' to that rim and adjusted some of 'those spokes' areas on that rim with a bit less tension on one side.. and tightened the other ones around them(some tighter)to compensate for the slight rim deformity.
I first get the rim good side to side,then I work to see if it has any up and down 'hop' to it:I then go after truing it 'Round' so the rim will spin 360 degrees Round w/o any Up & Down 'hop' in it.
I know there's a better word than 'hop'.. I usually call it Up and Down 'hop',rather than 'side to side' runout.
I would have rather just returned the defective/damaged rim and ordered better $ rims from Buchanans,etc.
A rim like that will eat-up alot of my time and use up patience,never allowing me a 100% TRUE result,but I can work with it to get it as close as I can to tolerate it..
Reminds me of certain negative people that I've met in my life: Taker's
No matter how much time I spend with them,it's a poor result later,for various reasons.