what can I do to delay the source

Rysc, I have thought of using i/o delay element on the clock. I don't remember where I read this, it says the maximum delay we can put in place is 800ps. That's why I didn't continue in that direction.

In your examples, what is the delay in terms of time we will get, if we can get 1.5ns delay, which is good enough since the most extreme case (fastest clock) is 165MHz = 6ns, a quarter of it is 1.5ns. And I believe this should work for the slow clock too.