Vyvanse or an IR med

How many of you guys have switched from Vyvanse to an IR med that is prescribed 2x a day? I metabolize Vyvanse very quickly. Feel it with in 20-30 minutes and peak duration of effects last around 2 hours. I am on 70mg, At my last appointment I tried out generic mydayis 37.5mg. I felt like it didn’t work well for my symptoms at all. Just made me feel like I had a bunch of bees swirling around in my chest and the 3 bead release was not great. I like Vyvanse, for me it kicks in and I’m get up and go. But it doesn’t last all day. And I’m reluctant to ask my PCP for a booster because I feel like he like XR meds more so who has switched from Vyvanse to an IR and had better success?