I had some time again to work on this and hopefully I will have some more in the coming weeks.
v0.30 was released, the new tests I introduced and that generated many false alerts are now fixed by skipping the ones that require further module installations. In addition the memory leak was addressed. (Not the huge consumption, only the leak that was caused by circular references).
I would appreciate receiving example Excel files that could be used to write tests to the various problems reported here or on RT. Please send sample files to szabgab @ cpan.org