As stated earlier, my vote is for new icons.
As for your point about leaving icons as they are, giving them greater significance, I have to disagree. The current post icons don't exactly jump out at you; their color scheme should be changed if that is to be part of their purpose.
The new post icons IMO should be about twice the size of the "post options" icons, and maybe give them a brighter color scheme; something that contrasts well against the light yellow and blue.
And, move the post extras to the cell containing username and picture. :-)
= Jim =