Adding a vapor line to your fuel filter

Did it eliminate hard start after driving and letting it sit for 15 mins
I wouldn't think it would eliminate that. That's normally caused by the fuel in the carburetor getting too hot or the fuel turning to vapor in the intake manifold. The latter of the two there's not a lot you can do about. But if the fuel is getting too hot in the carburetor, you can run a thick insulator gasket to mount the carburetor to the intake.