3 possible way to solve this:

1. maybe your dimmer not compatible with the LED light

2. voltage drop - i am assuming you loop the LED in series, is like switch to 1 to 2 to 3 to 4 back to switch
    what you should do is loop parallel , switch to 1 and back , switch to 2 and back etc  or use bigger cable if you do series

3. don't loop too many units together, like 8 unit with 2 dimmer switches instead one 1

if is the driver problem, then the unit is not suitable for dimming. then don't dim ...
i think no. 2 is the most common problem, even with Aztech LED

3 possible way to solve this:

1. maybe your dimmer not compatible with the LED light

2. voltage drop - i am assuming you loop the LED in series, is like switch to 1 to 2 to 3 to 4 back to switch
    what you should do is loop parallel , switch to 1 and back , switch to 2 and back etc  or use bigger cable if you do series

3. don't loop too many units together, like 8 unit with 2 dimmer switches instead one 1

if is the driver problem, then the unit is not suitable for dimming. then don't dim ...
i think no. 2 is the most common problem, even with Aztech LED

1. maybe your dimmer not compatible with the LED light
>>> i think you change to normal switch , cannot dim will be a easier solve
>> if 2 LED to a switch, dimmer shouldn't have any problem, so i guess is not dimmer problem
2. voltage drop - i am assuming you loop the LED in series, is like switch to 1 to 2 to 3 to 4 back to switch
    what you should do is loop parallel , switch to 1 and back , switch to 2 and back etc  or use bigger cable if you do series
>>> yes, you need to spend a lot, i guess you better live with it or don't dim at all

3. don't loop too many units together, like 8 unit with 2 dimmer switches instead one 1
>>> same as above

sorry, best to save money is not to dim, unless you want to spend some money there
also if dim the Power factor PF will drop, mean the brightness will drop even you max out the dimmer
depends on the dimmer and driver, it could be as much as 15% - 20%