Jotaro didnt really struggle against Bug-Eaten, he got gimped by it due to being so much faster then it that he simply plucked it out of the air, without time stop, which infected him.
And he had no issue dodging the shots when trying to dodge, it only became an issue when Bug-Eaten richocheted, which only got Jotaro because Jotaro wasnt expecting that the thing would have that type of intelligence to calculate angles and shots like that and Jotaro only noticed after getting hit, which snowballed as his legs and body got melted, unless Jotaro is assuming Kakyoin cant sneak attack, richochet, etc then he should be able to block with little effort, especially given that Dio, himself could block all the attacks with only one emerald out of hundreds managing to get a hit in and he's much slower then SP.
Honestly given that Jotaro knows how smart Kak is, knows that it can sneak attack, stealth, has the emerald splash, knows that it can attack from multiple directions, etc Jotaro wont be making the mistake he made with Bug-Eaten, which he assumed was as smart as a small rodent, and Jotaro only needs to cover 18 meters, that's only like 3 time stops at most, or a few seconds total in Kak's perspective due to cooldown, which Kak would likely take half of those seconds wondering what happened trying to figure it out, which he would but I doubt he can within like 5-10 seconds of time in his perspective.