Those leaves starting to get light green indicate it's ready for stronger nutes. I'm a bit stunned by people going over 6 gr. per gal. I haven't tried going over 6 with the newer versions, because back on Ver. 2 , I went to 6.5 gr. & got a terrible "N" tox. Never went past 6 since then.
How old is the N.L. ? Last N.L. Auto I grew hit the roof of my tent. That was crazy. She just wouldn't quit growing.
I think it took over 12 weeks to finish.
For the SIP, yes go to 2 gr. for 1-2 feedings, then 3 gr. for 1-3 feedings. Between 1 - 4 gr. you ramp things up pretty fast. After that you just increase .5 gr. when you see the leaves getting light green.
I'm currently seeking a new 1 or 2 part nutrient to try out. Thinking about trying Maxi Grow & Bloom. I'm just not happy with MC anymore. They change the formula too much so I can't ever dial things in because they change it again. If they'd just go back to Ver. 2 & leave it alone it would be great. Didn't need to dial anything in back then. Worked perfect straight from the bag.
Here's a plant I grew with Ver. 2.