Constructive advice for FWB

I'm just coming from my FWBs and need to give her some advice, but don't want to screw up the dynamic.

Her BJs are great for getting me close. She loves to drop throat. She pays attention to the balls and the shaft. It's great, until I get 98% of the way there. When she can tell I'm close, she locks into receiving mode and just plays with the tip. Meanwhile is been the attention to the base of the shaft that got me going in the first place.

How do I bring that up without sounding like a clown?