flash operation

Hey everyone! I have put my heart and soul into this project. Check it out here! However, being a full time pro photographer working on multiple projects, time has become an issue with this particular one. I could have just box it but for some reason I really want to see it live and evolve...

I face problems on built in flash operation in the field in macro photography. Despite I work usually on manual mode during shooting and flash mode is in TTL or in manual mode it does not work immediately for some time 10-15 min and it starts to work later. In contrast it works immediately...