AE86 slow on the revs and hesitant.

[allencr]

What's the compression?
Set the timing so it runs well, high fast smooth idle. Forget the timing light, toss it except for checking that the advance works & passing emissions! Advance it until it only pings/detonates when abused, with the octane of your choice.
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Advance is the ignition advance, 10-15 at idle, going up to 30 @3000rpm or there abouts, that's what really counts

The advance with the diagnostic plug means nothing at all, except for the diagnostic plug. I wouldn't care a bit about it.