Complementing my post above, here is the indicator I coded.

I grabbed a smoothed heikin ashi formula and combined with the formula from mladen´s heikin ashi histogram, and added a timeframe input, like you did.

If you set the smoothing period to 1 then it´s just a regular heikin ashi.

If you replay this one and yours, you will see that if you load both on a 15M timeframe and select "daily" on indicator settings, the one you did will show less color changes intrabar, waaaaay less.

If you could tweak this code here and add to it whatever you did on the other one to make that happen, it would be great. Or just tell me.

Best regards