Is there a way to determine what mesh(es) are used by the particle system when multiple meshes are assigned?

I have a single particle system with 3 meshes assigned in the renderer section. I want to have a single burst that spawns all 3 meshes at once. This almost works, but it appears that the meshes get chosen randomly, ex: it will spawn 1,1 and 2, and then the next time, 2,3,2 (no consistency), instead of having mesh 1, 2 and 3 spawn in the burst everytime.

The only two options I have right now are setting a fixed seed (which makes 1,2 and 3 spawn, but all other variables, like rotation/speed for each particle are fixed as well, which is not desirable), or just have multiple particle systems for each mesh, which is probably the closest I'll get, but I'm wondering if there is another option. If there is a way to use custom data/ override the function that selects which mesh gets spawned, or if there is just something in the inspector I missed, or something else I should look into, let me know. Thanks