It's cross on shore. Yes westerlies are gusty because you get wind pockets and shadow because of the heads.
Dint trust the pound creek wind reading for inverloch- it's usually windier than what it's reading. But all indications say tomorrow will be a pearler- 23 degrees south west 23-25 kts from lunch easing slowly.
At low tide there can be more sand than water so careful of the sand bars ;) but if you're not a beginner you should be able to stay up wind with chop or waves (further out) or play in the flat water close to the launch area.
Look on google earth, just east of the inverloch pier is the launch area (at the fishing club)- forecast conditions will be prime.