There is no way to fix that. The problem is that the extra padding applied to the list is user agent (HTML renderer) dependant. Some user agents allow it to be overridden, using non-standard CSS properties, some do not. And setting it to zero for the ones that do allow it, can end up breaking the rendering of the list.
The only way to "fix" that would be to not use html <ul> tags for the list. And I think the cure is worse than the disease in that case.
As for font sizes, turn off font size rescaling in the conversion dialog under look & feel.