timing issue or not?

I am having an off idle stumble problem with my 360 magnum and it is also hard to start when it is warmed up, i gotta crank on it a few times before it will fire up when it is at operating temp, i timed this engine when i first got it running and it was at 8-10 degrees btdc, but i had to re-jet the carb because it was a little rich out of the box, its an edelbrock 600cfm manual choke.
The original jets were .100 on primary side and .098 in the secondary, after some adjustments my engine likes the .092 jets on primary side and .092 jets in secondary, ever since i re-jetted it i have been having this off idle stumble and it is really bad when cold, my question is, do i need to re-time the engine or do something different with the carburetor? i have the acclerator pump set on the richest setting and it seemed to help a little but it did not eliminate the problem totally.