K2 Map Joomla plugin results fine tuning

I need to fine tuning the results of K2 Map Joomla plugin on my sites. In k2 categories where all items are in the same place, the map is displayed with a zoom level that is too high (21).The correct level would be 13. In categories where the items are in different places the map is ok, there is no need to change (this is very important!). In this plugin the zoom value for maps with many markers is automatically calculated by google's maps api. It works fine when markers are in different places, not if they are all in the same place. (zoom level too high). No prefixed zoom value was set when categories and items was created: the map uses default values. IMPORTANT! I ask for a fixed plugin installer: no database changes, no manually editing for new and old categories or items. The fixed plugin should display the map with the correct zoom level on the fly. I can't give access to the working site, neither his database or data. You must work whit plugin on your hosting and give me results. If it works as request (no database changes, no manually editing for new and old categories or items.) I'll pay, otherwise not.