I am the EXACT same stats as you, identical.
I owned a Burton Hero 155, There were lots of times that I wished it was a little bigger. Never once did I wish it was smaller. I put over 70 days on it.
This was my 23rd season.
I would 100% go with the 58
It's all preference, if you like riding smaller boards, go 155, if like larger ones go 158.
I think if he normally rides a 154 the 151 Super Hero should be fine as it uses the Raduction tech....but I think he may just be talking about the regular hero, which makes the point moot.