Help with my xj-13

So I have this xj. It's a light depRevatio girl. She's 18 days from harvest. Buds arent as big as they should be
6.3-6.5 ph. Soil,15 gal bag. Been adding small amounts of Xtra N,because satiVA hybrids can take a little more. Lo ts of yellowing leaves. Enclosed is a photo of my girls leaf.

Sometimes they will get that fade during the end of there life cycle,alotta growers only water last couple weeks to flush out the extra nutes for a smoother smoke