Looking at your figures, they are indisputable...but...by the look of it, you jump in the pool sometimes, and hit it with a load of hash, get fantastic returns then leave (my guess)
The block time for DTC IS 1 minute, so 60 blocks per hour * 24 hours = 1440 blocks per day
BUT
I cannot find the diff retarget time, i know the confirms was 3200, so i am guessing that the diff retarget is also very substantial, so i am guessing that what you are seeing is a fairly static mining situation, then you hit it with huge hash, becuase the diff takes say 3200 blocks to re adjust, you manage to mine blocks way too quick, then 24 hours later, when you stop mining, it is still waiting for to get to the next adjustment point, but since the overall hash has dropped again, it doesn't add much diff, then over next few days, it slowly drops diff back down, then whoop you swoop in again and over power it....
That is only my guess, perhaps Graham or someone else has the retarget figures?
Some coins retarget every single block, bitcoin and litecoin every 2016 blocks, other coins every 50 or 100 blocks.
My guess is if you mine consistently with 12500 cpd (upto 23000 cpd) then we would see the diff rise well over 9. it might take a while but the diff always adjusts......
I could be entirely wrong, but about 3 years ago i had a similar experience, i mined a cpu only coin....its block time was every 2 minutes, but literally no-one was mining it, so the global hash was 1KH/s, i could acheive 65KH/s with just 1 core....so i would solo mine it with 12 threads for approx 3-4 hours, mining a block about every 1-4 seconds, within that 3-4 hours i had mined over 100,000 coins, and then the diff would jump 10 fold, so i would stop, and come back 1-2 weeks later.....when i would find the blocks were coming 1 every 2 mins, and the diff was down at 0.00002414, so i'd repeat.....worked great for about 1 month or 2, then the other miners left, i broke the chain, and couldn't send coins to the 1 and only exchange. The coin still exists, it still has only 1 connection, but no explorer and no exchanges, and still exhibits the exact same behaviour.....
Any way thats my guess.....hopefully someone can find the whitepaper and that should have the diff retarget details in it.
For my part thou, i'd love everyone to mine this coin even less, cos with my 1 x 1060 3GB running @ 50% power, i cannot come even close to covering its power costs, however, if the diff were to drop below 8, then a single 1030GT (25 watt) would easily win blocks, and then if the diff dropped down to 7 and below, then the coin could be easily mined using a 6 or 8 core pc using grahams' wallet with built in miner.
TBH if we all stopped gpu mining, and only used the in wallet miner, once the diff dropped enough, we would get the same coins for literally no cpu power....then the coin might me worth mining. Lets face it, its never going to be more than a 1 sat coin, so the quicker we can lower the diff, and therefore lower the overall hash and cost to mine, the better. Then we can all fill our bags, then in about 6months to a year, it needs a real good pump, and we can all retire
