It has been stated at numerous occasions that enhancers are fundamentally the best category at fighting. They're the more balanced group, and possess at least 60% of mastery of any given category , while other groups can go as low as 40%.
Of course the plot plays a big role in the way that envents take place, but this can be explained, and it's stil plausible , one of the big strength of this serie.
Nothing in the fight between kururo and hisoka goes against the rules set by togashi.
Kururo took the initiative , using the referee while attacknig simultaneously , at close range hisoka could have used bungee gum , sticking crollo with it in theroy, but in this case we can assume that chrollo was using gyo on his feet so hisoka had to protect himsel accordingly in the first place using gyo (or ko if chrollo was using that skill himself).
Those same principles explain the advantages of the enhancers, and why the other categories need to bypass this inferiority in a direct confrontation and not the other way around.
To stick an antenna with "black voice" you need to bypass your opponent ken, using shu for sure, that's not an easy task facing an enhancer of comparable strength. It's fancy to be able to control someone, but in a direct 1 VS 1 confrontation that's not that useful, for example phinx with his hatsu can also ends the figth as long as he connects one time. When generally enhancers are also more talented physically , thus more quick, fast,etc (in the pnnatom troupe for example, while nobunaga is mediocre, strength wise phinx and uvo are the more powerful, in the rankings at the top many are emitters or transmutters, the two other categories near enhancement.....) we can easily see why conjurer and manipulator avoid the close range fight.
It's very fancy to be able to poison or put asleep your opponent, but in a fight one rock, one big bang attack or one ripper cyclotron (strike that can not be blocked basically by an opponent fo comparable strenght), well you're dead.