Altitude Advice

A320 heading 030 @ 35000 ft
Wind 260@75kkts
My max speed available 280 kts.

I decended to 25000
Wind 260@49 kts
My max speed 360 kts

Is this correct practice (I’m over Pacific heading to Easter Island)

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From what you have posted, it appears you are using Indicated Airspeed (IAS) for your speeds. Since air density decreases with altitude, so will your indicated airspeed. That’s why your max speed appeared to increase when you descended to FL250. You descended down into denser air. If you want to compare apples to apples, you need to be looking at True Airspeed (TAS).

The below has a good explanation.

If you’re looking for the most efficent altitudes for a given flight, I’d suggest using Simbrief to plan a trip. It calculates routes and (theoretically) optimal altitudes given the wind conditions.