The NW wind in Alvor is generally between 15 and 25 knots. You could get one day every now and then when it blows up to 30 knots but it's really rare. I would say that you are pretty well covered with the 13 and 10. The NW wind usually blows the strongest between 15:00 and 19:00.
In July and August there are also some isolated days when the wind blows from ESE, On those days you will be able to ride in Lagos with some waves, but in this case the wind blows strongest in the mornings from 7:00 to 11:00 and better for your 13.
the wind in Carrapateira is waaaay much lighter than Lagos and Alvor. Don't go there hoping to kite unless it's nuking in Lagos and Sagres. Plus it's deceiving because when you arrive at the bluff overlooking the beach, the wind always feel stronger than it really is in the water. If the wind in Sagres is strong, but it's too light to kite in Carrapateira, head down to Cordoama near Vila do Bispo where the wind is a bit stronger. You have to watch out for rocks in the water but it's the best option in the west coast near Sagres.
If it's blowing from SW in Sagres (very rare in the summer but it happens sometimes) you can ride in Martinhal.
In Sagres (especially the west coast) a wetsuit is advised (at least a shorty). In Alvor you can stick to boardshorts especially if you only ride in the lagoon.
You can check the wind live in Lagos and other Algarve spots in this website.