[HELP] Double Wave Cooked On Mobile

I’m talking about two levels in particular, deadlocked and ultra violence. Both levels have double wave sequences that just feel SUPER INCONSISTENT. Like I can beat them about 50-60% of the time but the other 50% of the time I just die, so I end up having to get lucky (they’re also at the ends of the levels). I can’t do a “straight wave” (like even triangles above and below the wave) on wave, so it might just be a skill issue. IMO the rest of the levels are honestly pretty easy.

Should start training consistent wave, or am I just tapping wrong or doing something wrong?

For context, I play on a higher end iPhone 13 with excellent graphics and minimal lag.