pH Adjusting with Advanced Nutrients Sensi pH Perfect

Anyone have experience with Advanced Nutrients pH perfect line?

I'm about 4 weeks into flower with White Widow and Critical Mass CBD. The seeds are from ILGM. Growing in Fox Farm Happy Frog. I've been using Advanced Nutrients pH Perfect Sensi (Grow and Bloom) with a few of their other products (Voodoo Juice, B52, Big Bud, Bud Candy and Overdrive). This is my first time using a "pH perfect" nutrient system. The plants are looking healthy, no signs of deficiencies, and I haven't been adjusting pH up until now.

I use RO water that's measuring at 0 PPM and around a 7 pH. After adding the "pH perfect" nutes it's around 1,050 PPM and the pH drops to around 4-4.5. This seems crazy low to me. My understanding is that part of what makes Advanced Nutrients "pH perfect" is that they're chelated to be available to the plant at a wide range of pH. So now I'm wondering if my plants are doing OK because they're still able to get nutrients at this pH, despite it being really low. And if that's the case, wouldn't it be better to bring the pH up to at least around 6 for even better results?

I've read in a lot of places to not mess with the pH of "pH perfect" nutes, but I'm wondering what harm could possibly come from getting the pH back to a reasonable level.

Let it sit for a bit, hr it so, then check it
It should buffer itself

And be sure yer pH pen is reading correctly

Ive tried it on a minimal level and tried to ph it manually as it was supposed to buffer to around 6 and didn't.
The result was it just went back to what ever it settled to the first time so I gave up trying.
It was some left over stuff I was storing for a mate so once it was gone it was gone.
Never had any problems running it though.

Thanks for the replies!

I'm using General Hydroponics liquid pH test, the one where you fill a little vial half full of water then add a few drops of the test indicator and give it a shake. Yesterday I mixed up a batch of nutrients around 12:30pm and let it sit. It started at around a pH of 4 and by 5pm (over four hours later) the pH had risen a little to about 4.5. I used pH up to get it to around a pH of 6 and then let it sit over night. Today it's still around 6. I think going forward I'll start pHing it to around 6-6.5 since it seems like that could only help.

I've been getting good results so far with Advanced Nutrients regardless of the pH measurements. The plants seem really happy. I'm just trying to figure out if things could be even better by adjusting the pH. I included a couple of pics, one from about a month ago when they were still in veg and one more recent during flower.