IC600 and Flash Shadow

[MX-5Racer]

I have an IC600 with housing and I love it 95% of the time. Can't beat it for the price. However, the flash will cast a shadow across the left of the photo. I have used an external strobe that will trigger from the IC600, but it is large and doesn't always fire. I would rather carry just the camera. I have read somewhere installing a diffuser may fix this, but there was no other instuctions on how to do this.
Do you have a fix or tip to correct this (other than use external strobe)?

Here are some samples. Thanks for the help

 

[jester1226]

Check your hand placement when holding the unit. Just slightly having your finger near the flash will cause dramatic negative effects. Many people do this without even realizing it.

 

[nomro]

I have the IC 12 and it has the same issue , this is due to the flash placement in reference to the Lens barrel of the case. The issue can be resolved by adding a flash diffuser( IC 600 / IC 12 Diffuser). I bought one and it worked for me . I hope this helps.

 

[nomro]

Here is the link:

Intova Flash Diffuser | Intova