I'm not familar with the Leaper 10 but I have dabbled a bit with TSOP on-board programming with limited success.
If you are able to read from the Tsop but not write - I'm wondering if you are properly controlling the WE/CE. You have to actually disconnect them from the the "motherboard" so to speak and control them manually. I'm also wondering if the image that you read is accurate. I've had a few images where the data is shifted because one of my data lines was not working.
I have played with Frohwein's Flash EEPROM programmer found at:
Best of luck.