I see a bit of a problem....

 I see a bit of a problem.... not sure what the best way to go and why its doing that, all I can suggest is trying to reduce the load on the arduino with yet more transistors? If I think of anything else I will let you know.
You could quite easily communicate between two arduino's. Create a software serial port on each arduino assign pins like for example RX =2 and TX=3 and connect the RX of one arduino to the TX of the other and vice versa. You will also need a wire between both arduino grounds. Then just serial print values between them. Let me know if you need any more help with that.
 

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