I have not actually stacked my Smarty with my HOT Juice, sold the HOT Juice before I got the Smarty. I did stack it with my BDTD Crazy Larry program. It is not a really good stack as far as I could tell.
If I was going to stack them I would not use the HOT 180hp level on the Juice, I would try the 80hp or 100hp level and start with Smarty #2 (60hp no timing) and then go up the ladder on the even number Smarty programs(no timing). You can always push the button on the Attitude to go up to the 180hp level and see what it does, but I think you will find a better combo and more usable power on the lower Juice/Attitude settings. Just my opinion after trying many different stack combos.