How important is Spanish Cedar?

[bonjing]

How important is spanish cedar? I have smoked a few cigars out of my little coleman, and all of them have tasted bitter to me. I cleaned out the cooler with soap and water and let it air for about a week before putting my cigars in. I have a some sheets that came off some cigars in there, along with some inserts from another box that i placed in there as well. I also added a small cigar box inside that i hope has some spanish cedar as well.

the cigars were:
CAO gold
Ashton Heriatage
Avo domain, signature and xo

and all had the same flavor profile, just out right bitter through and through. the AVO's and the CAO all came as a sampler package if that helps anything. i have moved the left over cigars into my humidor hoping to salvage them if there may be something wrong with the storage.

it has been cold here lately, the coleman is about 60 degrees while the RH is set at 65% using heartfelt beads. the beads are placed on the lid of the cooler and the size of the cooler is 9qt while using 2oz of beads.