I dont know for sure but you are right suspension does blow me up with h20...thats why i havent done it in years.
A few guesses -
1-It is mg for mg the most powerful test b/c no esther attached so 100mg is truely 100mg of testosterone.
2-very rapidly enters system so also prob very rapidly aromitizes
3-leaves system quickly leaving hi estrogen levels with low test levels ..even if for short time periods (till next shot)
All three of these are guesses ..i dont know ..hoping someone can shed light on this ..im curious also.