Speed Triple Misfire

Hi just bought an 05 speed triple 1050
Low mileage took it out and took it through its paces today and its developed a low rev misfire underlined upto about 3k revs tried a bottle of injector cleaner .will try new plugs tomorrow .any more ideas???

 

Put new plugs in today and seems better but only pottered around in the wet so will give it a blast when its dry and hopefully it's all good
Many thanks