The maximum power achievable is 1405.
Here's how power is calculated:
Latent Power: Increases your power by (base power)/2. (Rounded down)
Combo Bonus (6+ Loops): Increases your power by (base power)/2. (Rounded down)
Charge Level 2: Increases your power by (base power)*2
Power Plus: A flat +5 power boost not affected by any multipliers.
Hence, with the highest base power of 350 (displayed as 355 from Power Plus). The maximum power achievable is 350 + 350/2 + 350/2 + 350*2 + 5 = 1405.
The math checks out for Sempi's level 50 Capture Styler too. It has a base power of 205 (without the +5 from Power Plus).
With only Latent Power (and Power Plus): 205 + ⌊205/2⌋ + 5 = 312
With Latent Power & Charge Level 2 (and Power Plus): 205 + ⌊205/2⌋ + 205*2 + 5 = 722
With everything: 205 + ⌊205/2⌋ + ⌊205/2⌋ + 205*2 + 5 = 824.