Need advice on stock suspension tips 2008 CM SR5

Bought the truck a month ago. First truck. Three Siennas before that. Had 97K on the clock so I wanted to update suspension. I am having knee replacement done in the next three months so I need to keep expenses down and do not want the truck higher til after I get back to work after surgery. Bought new 5100 Bilsteins for the rear and bought new take off stock front coil overs. Corners better now. Still shakes and gets nervous in the front over bumps. Are stock coil overs adjustable? I am running stock wheels and tires at 37 psi. Will this suspension smooth out more with another 10K on it? Planning a lift and new wheels and big tires when I get back to work and get healed up. Any and all help would be greatly appreciated. Peace. D