Cant say anything about retarget algo without the code.
In the code provided I found a quicker PPC retarget with limiter.
If this is the algo, it is simply a "PPC retarget, but broken"
It would be unstable and suffer long blockchain slowdowns, diff stranding.
JPU moved to "not an altcoin" until code provided.
LOL, funny that its never been stranded once, despite huge swells in difficulty and influxes and exoduses of hashrate. the retarget works perfectly. there is nothing broken about the ppcoin code.. i challenge you to try the coin before spouting your pompus opinions based in your own assumptions.