Thanks Jagube! This should be enough to get me going. Will go for:

1: should I do the sunflower NPS pulls at room temp? Yes

2: how much NPS volume to use per pull? 50ml for 50g bark

3: how long should each pull last? 45min

4: how many pulls to perform? 6x pulls

5: what acidic solution volume and max pH should I use for the example above? pH 4

6: how long should I let the back-salting occur? 30min *

7: after separating the acidic solution, how many times to add a acid back-pull to the NPS? 3x

I forgot to ask: I will use sodium carbonate as base. Is a base to MHRB ratio of 2:1 by weight good?

That's 100g sodium carbonate for 50g bark, in a 700ml total solution volume.

A/B extraction, acidic stage prior base @ 4 pH.

You say colorless, but sunflower oil is yellow from itself, no?

* Which wiki? 5min sounds short. More time (30 min) won't hurt, correct? I've done 30 min back-salting for mini-A/B clean-up on Earthwalkers ACRB tek, which worked but I did notice more yellow coloring of the acidic solution near the end of the duration.

Interesting. Will start out with sunflower oil. Maybe try coco later.