Can I add more than 1.5 lift on coilovers without blowing them?

I installed these coilovers with 6000 miles on them, drove 1800 miles and both were blown!

Sent back to icon, and they said it was my fault for putting too much preload. I thought with coilovers the suspension is adjustable and I can put 3'' of lift as advertised.

My truck looks terrible with icon's preset setting.

Can I add any more lift or will I be needing to send these in for another rebuild if I dare adjust them?

Pictures below.

 

The maximum thread showing for the standard 158504 coil spring is 2.13" & the maximum thread showing for the HD/Expo 158508 coil spring is 1.13".



This is the area you will need to measure.

Here is a YouTube video we're created to help.
https://youtu.be/rKUUmbhUrpg