Hesitation issues - need help

I have had it adjusted so it can idle at around 700 rpm in gear at lights, but now it's idling lower than that and I can't seem to get it back to 700 range when in gear.

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Did this change all by itself?
A gradual change is usually an A/F thing; like a vacuum leak, or a plugged air-bleed or crappy gas, or the secondaries not staying closed,or a faulty PCV, or sometimes; tight valve lash.
A sudden change is often slipped timing, or a blown PV.
You do know that the acc.pump linkage needs to be reset after almost every idle speed screw adjustment, right?

Assuming the ignition system is capable, then, to recap; Is/was
The hesitation from a gentle tip-in? If yes,then this is all in the low-speed circuit,which starts with the fuel level.
If the hesitation occurs when stomping it, that would be the Acc pump.
If it occurs under moderate primary only feeding, the then the PV may be too slow to open.
If it happens every time the secondaries open, well, that would be the secondary actuating spring.
10* initial is not enough for the 268 in a teener, but that will get worked out in the T-Port sync.Don't forget to limit the power-timing to 32 to 36 degrees
Yes there is a slim chance that the PV is leaking fuel.

AJ's guide to Transfer Port Synchronization