Hesitation issues - need help

So I put in new ignition wires. Reset the idle mixture screws all the way in and then backed them out 1 1/2 turns each. Got initial timing set to 10* BTDC, but need to redo it because I don't think I did it correctly. Anyway, ran it to the beach and back over the last couple of days, a total of about 70 miles. Starts but then rough and low idle, difficult to keep running. After about 10 minutes of driving - stalling, surging and a backfire or two - it runs great. No hesitation, no stalling, smooth acceleration from stop and at highway speeds, 700-800 idle in gear. Then when I park it idle is high in "Park", after an hour or so rest it repeats above scenario. So I'm going to make sure on the initial timing and advance it to 15*, then take a shot at the total timing and get it advanced to 34*. Hopefully that does it, but if not, I'll go through the other suggestions, although I'm also thinking about upgrading the PCV from stock.

BTW: my original hesitation issues were at "gentle tip-in." Tromping on it has not been the problem.