high concentration deca is FAR different than high sustanon.. sustanon is 40% short esters and short esters in normal concentration can often cause PIP but especially will be problematic at high concentrationAfter my chats with Domestic... says it's all the same carrier oil MCT... so that can't be it... other 2 things they said... short ester reaction, but done mix esters before just not Sustanon... other thing is high concentration test perhaps 500... process of elimination, can't be MCT carrier oil... short esters maybe on Sustanon specific or high test concentration... no issue with high concentration Deca.
Appreciate your input as always bro !