The f pads are what I use with my PS500e, really fun. The imaging (centre of the soundstage) does suffer a bit, and you lose maybe 5-10 % detail, but the upside is great bass, thick mids that really beef up power chords/overdriven guitars and overall pleasing impact.
The Geekria LL (I *think* that’s the model name, pic below of the donut style shape) are the safe choice between the F and L pads, you get those nice bass vibrations still, slightly lighter weight mids and better imaging + detail. There’s a big difference for me, even at that halfway point, between the Grado L pads (which are just too lightweight sounding for me) and the Geekria ones, so I tend to switch between the latter and the F pads depending on mood.