Yellowing at bottom and top PICS

Its alittle over two weeks into flowering and the bottom leave are yellowing, mostly just the lower fan leaves..

I figured it was b/c of the lack of light but now the tops are yellowing on the inside of the leaves, pic below.

Basically there all looking way to yellow under the hps light.

Should i up the amount of nutes? I feel like i havn't been givin them enough. Using sensi grow/bloom.Started at 1/4 strength

That's pretty normal. I'd just keep doing what you're doing. You could up it, but watch real close for burning at the tips. If you see burning obviously dial it back.

looks like you could give them some more nutes. kinda hard to tell from the pic.

Looks like a possible Magnesium deficiency, either due to low Magnesium or your PH being off.
What's your PH?