Speeding drivers on narrow lane without pavement

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I walk our dog on a narrow country road that does not have a pavement.
Our village in Cornwall does not have pavements.
I walk during the day and wear a high viz jacket.
The speed limit is 30mph.
Most drivers slow down for me and I wave to thank them but some drive past far too fast and don't slow at all. They may be still under the speed limit, but they are not at a reasonable speed for the conditions.
Should use a hand signal to ask them to slow down, or is that unwise as some drivers are for some reason, easily enraged.
What would you do.
Thanks for any advice.

Use the appropriate hand signal for slowing down. It's waving the right arm up and down.

I once did this to a driver going fast on a country lane and he screeched to a halt further up the lane and reversed aggressively back to where I was and gave me an earful. He said "It's a 30 limit - I was doing 30." He did not like it when I pointed out that it is a limit, not an instruction and that he still had to drive to the conditions. We were at a narrower point in the road on a bend. He went roaring off in high dudgeon.

You have to be careful - people who are stupid enough not to drive to the road conditions are not necessarily polite sensible human beings .......

I'd take the easy life and walk a route where I wasn't regulalry encountering cars going too fast for my liking.

We are farming and we have a council road leading to our farm which is a dead end once you get to us. It's become a dog walking spot because it's a quiet tarmac road, and I'm in no doubt it's considered a footpath by many locally rather than a road. It's not narrow (goes across open moorland) but people seem really annoyed when we approach in vehicles and they have to put dogs on leads or step off the road to let us pass. Someone shouted at as once because we went past too fast on a quadbike - we had a poorly sheep in the trailer and they could have stepped off the road onto the moor and chose not to.

I think this is one of those situations, you don't have to walk on the road, you are choosing too, I'm sure there are other options and you can't really get annoyed at other road users using the road legally but in a way that you don't like.

Personally I wouldn't choose to walk my dogs on such a road if you have identified it's not that safe.

I think you possibly are also under estimating the driver's ability to see you in your hivis and your under control dog and comfortably and safely avoid you as they pass even if it is at 25mph rather than your preferred 15mph.

Thanks for your advice.
If a driver is below the speed limit, they can still be driving illegally if their speed should be slower for the conditions : narrow lane without pavement, pedestrian also using the road.
The lane in question runs next to my house and I don't want to stop using it. I believe walkers have as much right to use it as drivers. There needs to be mutual respect.

we too are rural no pavements or street lamps but but a steady stream of cars going through.walking the dogs feels dangerous.