esc issue

never mind about smidsy

For a more detailed answer to your question, if you open up the casing of the electronize you will see a large relay in the middle of the board at one end. This has 8 pins underneath soldered to the board. You have to unsolder these 8 connections carefully then put another relay in it's place and solder it on (look for videos on youtube etc for advice on soldering)

Can you recommend a good relay? maybe even one with a higher amp rating as a mod for both esc's?

Linking to this website is a bit odd, so go to hints & tips and then Electronize speed controller external relay mod. Assuming you're using 30a models, it should help.

http://ukrobotics.com/ukrobotics/index2.htm

I believe the 15a versions are different.

I'm using the 15a ones so not sure how they could differ