So why did Jesus call Himself the Son of Man coming on the clouds of heaven and why did the high priest recognize that as blasphemy?
It's very weird to expect a 1st century Jew to express ideas in the way a 21st century westerner would like it expressed. Point is everybody around Jesus, His disciples, His audience and even His enemies all took the message from His discourses that He was claiming to be God. They either worshipped Him as God or charged Him with blasphemy/crucified Him for claiming to be God
You need to ask yourself why exactly that is.