Multiple MK187 problem

I bought 10pcs MK187 for dimming LED tubes on 12V DC 1 to 3 amp
one works fine, but when I use 2 or more they starts flikkering
I tried capacitors and coils, but this give only weak improvement
anyone has a solution?
thanks

Just a thought,
Are you running them all on the same power supply?
How much current do the LEDs pull?
How many amps can the power supply deliver?
Have you tested them individually?

hi, they run the same power supply, 90AH lead-acid battery with 5m cable 2.50mm²
current between 1-3A
100A is no problem for the PS (battery)
when I switch them individually they works fine
a 4700uf capacitor at the end of the cable reduce flikkering for 30%