Thanks Clive,
Your quick reply is always appreciated. I think Mr. L saw that with the reduced cash reserve it could be burned rather quickly if he didn't expand the entire Hold Zone's size.
Each purchase burns a lot of residual cash, but the distance from a Sell to a Buy with AIM-High was larger. So, the effect is less frequent but larger transactions when they occur. Still, 20% cash under AIM-High only allowed for about two sequential purchases.
I tend to use roughly AIM-High settings on my income holdings. I own them for income, not trading or appreciation gains, so infrequent but substantial trades are welcome. Income flow is relatively steady and by AIM's mechanism, I am usually only selling when the income components are richly priced and only buying when the effective yield is far more generous.