Maybe I’m wrong, but as far as I understand your minting probability only depends on your individual transaction IDs, not on the address holding the coins. (c.f. FindstakeJS --> FindstakeSinglePage).
So if you’re holding 10K PPC, your can indeed split your coins to different transactions but not necessary to different adresses (i.e. you can just send these coins to your own address that will have the same results).
BTW, you don’t increase your chances, you just spread the chances. For example, if you have 50% chances to mint within 24h with 10K PPC, if you are able to reach the same coinage in total with 5K PPC + 5K PPC you have 25% + 25% chances to mint within 24h. You will receive the same reward in total for 10K PPC minted, you reward will come in smaller quantities but more often.
EDIT: btw, it is to be noted that your coinage stops after 90 days… so in fact you may want to adjust your transactions’ total amount of unspent coins accordingly. i.e. It’s best to have 10x5K PPC transactions than 50K transaction as it takes 30 days for the 50K transaction to reload its coinage after staking (so you have to wait 30 days until the next reward, and the PoS diff may vary in-between). Same problem happens if you split your coins in too little amounts: 10000x5PPC, none will ever stake at the current difficulty… and will be stuck at 90x5 coinage per transaction. Is anyone interested in calculating the ideal amount of coins to hold per transaction at the current difficulty to have the best compromise between a more frequent reward and minting probability?
EDIT2: Actually in any cases, if you split or not, you cannot earn more than 1%. The more you split the less you earn, but your earnings arrive more frequently, which is a good thing if you want to mint with a PoS difficulty averaged.