Limited dimming range with Philips G4 bulbs

I replaced 9 halogen bulbs with Philips G4 2.1W LED bulbs (link), which say they are dimmable.

I bought a Shelly RGBW2 with the intention to use it to dim these bulbs.

While the bulbs say they use AC, the site I linked above says it can also take DC.

I tested the setup with one bulb on my desk, with a DC lab power supply.

I noticed that it was indeed dimmable, but only for a limited range.

It started going dim when I dimmed the Shelly all the way to 40% and the bulb went off at 11%, so there is only about 30% dimming range.

The bulb also didn't dim very much, even at 11%, before it went off.

Is there a way to increase the dimming range?

The Shelly works with PWM dimming, should I find another way to dim these leds?

That's what I was thinking as well, maybe the load is too low?

The specs don't say anything about a minimum load.

I'll try it with all 9 bulbs in parallel.

If that doesn't work, should I add a dummy load?

Ok, I installed everything and in fact it's even worse now.

Dimming of the bulbs only happens now at about 20%, so the dimming range is even smaller.

These bulbs are very hard to dim!