No, it is not too small. Jibing might take some more concentration at first, but that is something you get used to quickly. The 86 will definitely be a more allround board for general sailing than a bigger version.
But if you are mainly focused on freestyle tricks (and sail a lot 5.3 and above) a 96 could make sense, but then it might even make more sense to get a freestyle board like the Flare.
If it is a multi purpose board with a wide range you're looking for, the Kombat 86 is probably the best choice.