Good effort (there is a similar mod for the Solis 166 AKA the Delonghi KG100 and various other models....)
These (unlike yours) have real sharp burr sets (sharp enough to cut your finger). The grinding process- especially for espresso- is to shave off small fragments of the bean rather than to crush it.
The mod to the Solis isnt very effective because the play in the bearings make small grind size too erratic.....
To test the grinds, take a pinch in the palm of your hand and rub them around with your finger.... you should have even size "grains of salt" like bits of coffee - no fine powder, just uniform pieces.
When this is done with the Solis grounds (and I suspect yours will be as bad - if not worse) you get lots of fine powder and bits of varying size. This packs down into the PF and generally blocks it totally... forcing you to increase the grind size. You then have big chunks and small, correct size bits!!
Result - coffee with poor or no crema and a bitter taste from the over extraction of the smaller bits of coffee bean.