just my opinion, I wouldn't buy now if I wanted to go back onboard, I would consider buying only the IPO shares.
But... Who cares +170Th if they are proportionally divided into those new shares that are thrown to the market? You will have the same Hash per share, not more. Because more hash, implies more shares. (That's what I've understood... correct me if I'm wrong)
Hashrate per share stays the same.