Well, been riding for 36 years and once or twice in the rain
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I've never enjoyed riding in the rain, and TBH a lot of it is about confidence in your tyres and your bike. I found that I rode better in the wet when it was dark because I didn't worry so much and couldn't "see" the road conditions. Then I realised I could ride those roads in the daytime when it was wet without any issues.
You're right to be careful at roundabouts tho, higher gears and smooth throttle operation is the key. Plan your corners.
But its easy for people to tell you what to do, only you can do it. Its no different to new riders and leaning the bike over in the dry, confidence in the bike and tyres.
Hope this rambling makes some sense