You have to have patience when solo mining... Instead of getting constant shares all the time you will now be getting blocks several times a day. From my experience, at this difficulty and your 7500Kh/s hash rate, you should have gotten around 3 blocks in the last 12 hours if you are set up correctly with the stock Spreadcoin miner...

But be aware, it isn't consistent like clockwork. I have gone many hours without seeing a single block only to have a bunch of them pop up in the next few hours...

 Check out my wallet for an example... Look at Feb 3.


Notice from 03:58 to 12:10 and from 12:10 to 21:47, 8 and 9.7 hours respectively, or 17.7 hours total, I only got two blocks... But then in the next 18 minutes at  21:48, 21:55, and 22:05 I got 3 blocks bam, bam, bam...

It's all about long term average.

Hope that helps!