Hi summomers, there is some informations about increasing your units :

For a lvl 30 unit +5 enhanced:

The first 2 increase counted will be :
- Giant phase upgrade : about +20 or 25%(ATK,HP)
- green cristal upgrade : about +20 or 25%(ATK,HP)

Then Lab search increase stats is aplied after the 2 previous (Giant, green cristal) :
- Lab search : +30%(ATK,HP)

Then Main unit increase stat is aplied :
- Main unit : +10%(ATK,HP)

So what is important to understand is :
- A giant phase or green cristal upgrade will be buffed by +30% from lab search and +10% from main unit!
- The lab search increase more the stats than Giant phase or gc upgrade