I have a Lamy Studio fitted with the 1.9 nib. Trying to use Diamine Peacock Flare shimmering ink.

The pen writes fine but there is very little if any shimmer. The shimmer comes out fine with some other pens I have which have flex nibs.

I do "agitate" the pen prior to writing and am using Tomoe River 52gsm paper.

Any suggestions would be welcome!