Dose might be too high- Could taking Vyvanse with breakfast lessen the side effects?

Sorry I know this is something that's probably overly discussed but I tried looking and only see people saying it just made the effects of the medicine work better.

I recently increased from 40mg of generic (Lisdexamfetamine) to 50mg. I started taking it in August and have been increasing since. I've had zero negative side effects until I started on the 50mg but now after that dose increase, my heart rate seems higher. I am 34F and overweight so... lol but I've never had heart issues before and my EKG I had to take before starting meds was good.

I usually take it at about 5:30am and then I'll eat a little something like 2 hours later. I'm wondering if I were to take it with Greek yogurt in the morning if maybe it'll help the heart rate issue? Or does that only work to make the meds work better and won't help the negative side effects at all?

Thinking I might have to go back to the 40mg but I just wanted to see if there was an easy solution first.