See, this is what I meant by over complicating. You want things to work but your specific way. It’s not always possible… such is the situation and life is not that easy haha.
There is literally no difference in terms of quality of service between Mullvad and IVPN as they are both fantastic options. If Mullvad works better objectively in your case, that’s what you ought to use. But you’re personal preference (for whatever reason) is making you stick with or at-least prefer IVPN.
Then ask yourself why you don’t love it. It is more often than not, simply personal bias which is highly subjective. But objectively, no difference unless, again, if you have some very specific reasons (in which case you really don’t have a solution from anyone).
I for example use Proton on desktop (since it helps with streaming) but Mullvad on iOS because I find it more robust on mobile. I suggest Mullvad to my parents because its easier to use (simplicity of the UI/UX) and given it’s robustness and affordability.
Everyone has their preferences but everyone ought to use what works for them.
Edit: that’s all I have to say on the matter. Now, you do you and good luck!