Decision for timing closure based on seeds

Yup my design is on the edge as even in cases where i am meeting timing is with 165.34 ,offcourse with a slight change it might never meet timing again.

Thanks a lot for your advice.

One more question (although deviating from the current topic)

I have found that when i increase the fitter and router efforts to 8.0 from 1.0, these constraints seem to worsen the timings which are unexpected but yes i have tried them only with the default seed ie 1. My current results were with efforts level for both at 1.0. They might provide better results if i try a seed sweep with these increased efforts levels but at the cost of a lot of time .

So would you suggest me to try out this or probably work more on other constraints as my RTL has passed verification and i dont want touch it since i want to try meeting maximum seeds with some other quartus constraints.

Thank you for your time. :)