Explosões cinéticas são descritas como ataques à distância, e, a menos que seja indicado de outra forma, você adiciona seu modificador de Destreza a jogadas de ataque à distância
Na página Kineticist :
Physical blasts are ranged attacks that deal an amount of damage equal to 1d6+1 + the kineticist's Constitution modifier, increasing by 1d6+1 for every 2 kineticist levels beyond 1st. Spell resistance doesn't apply against physical blasts. Energy blasts are ranged touch attacks that deal an amount of damage equal to 1d6 + 1/2 the kineticist's Constitution modifier, increasing by 1d6 for every 2 kineticist levels beyond 1st.
Attack Bonus
Your attack bonus with a melee weapon is : Base attack bonus + Strength modifier + size modifier
Your attack bonus with a ranged weapon is : Base attack bonus + Dexterity modifier + size modifier + range penalty
Touch Attacks
Some attacks completely disregard armor, including shields and natural armor—the aggressor need only touch a foe for such an attack to take full effect. In these cases, the attacker makes a touch attack roll (either ranged or melee).
Então você apenas usa seu modificador de Destreza para as jogadas de ataque.