Prop up my Titan 29?

[Bigbore]

This is my present setup and I feel it perfect to run the boat in the open sea when the water is very calm and there are only few chops.
Motor: Leopard 4082 1600Kv
ESC: Hobbywing Seaking 180A-R
Timing: 15°
Battery: Zippy 5000mAh 40C 5S2P
COG@ 30%

Prop: X440/3
Run time: 5 min
ESC Caps: 49°C 120F
ESC Temp: 42°C 107F
Motor Temp: 38°C 100F
Zippy: 52°C 125F
Vmax= 71,1Km/h 44mph

Prop:M445
Run time: 5 min
ESC Caps: 55°C 131F
Etti Caps: 44°C 111F
ESC Temp: 49°C 120F
Motor Temp: 42°C 107F
Zippy: 48°C 118F
Vmax= 72,7 Km/h 44,8 mph

I prefer M445 because it provides faster aceleration.
I was told M props are like the X but with out the tung and this makes a little more slip at low speeds and then higher speeds at top speed.

What prop should I try to reach 50mph at the pond with mirror water?
Same diameter and bigger pitch (X645)?
Or same pitch and bigger diameter (M447)?

[Make-a-Wake]

Try an x642 or an s220.

[Bigbore]

Try an x642 or an s220.

Thank you for your advice.
So, no more than 45mm prop on this boat?

[Make-a-Wake]

You'll get into some torque roll issues if you go much bigger diameter

[dana]

Wake is right. Bigger prop= torque roll. X642 for your motor. I run 3674 1700kv on 5s with x444 and get consistent 49mph

[Bigbore]

This morning at the pond on mirror water I had the fastest and hottest run ever with this Leopard 4082 1600Kv
I was able to run full throttle always ... while turning too and the Zippys went at LVC in 3,5 minutes and these were the temps still with M445 Prop:

ESC Caps: 56°C = 133F
Etti Caps: 44°C = 111F
ESC Temp: 51°C = 124F
Motor Temp: 51°C = 124F
Zippy: 60°C = 140F

Top speed was 78Km/h = 48,5mph

I read that 140F is the hottest temp for ESC and motor.
Am I cooking the batteries?
What are your suggestions? Can I prop up without ??