Not to sound arsey but I've sunk hundreds of hours into the FromSoft games so I understand the mechanics but I just cannot work out Radahn's timing at all - always end up rolling too early or too late.
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Off the top of my head, I'm probably around level 65-70 with a +15 Uchigatana and the royal remains armour set which I'm not sure if it's any good but I like the look of it!
Was using the summons as bait more than damage-dealers but they did end up putting a bit of a barrier been me and Radahn so my attacks kept missing. He's the only boss I've really struggled with - Rennala, for example, was a walk in the park.