i can't play multi-table. i can't think quickly. 

and i don't like to play multi-table. when i play multi-table, i decide automatic decision.

so i play only two table.

you may say. "just two table?"

but i think two table is comfortable for me. and i can play A-game.

i don't feel good when i play c-game(automatic play,decision)

My main game is tournament. but i am said that tournament needs a lot of volume than cash game.

so i really worry about my two-tabling. and i thought "Do i have to change my main game?"

but i love to play tournament than cash game. but i am still worry about problem of volume.

Do i have to change my main game? 

or playing high buy-in tournament than before? (because i only play two table...)

i don't have many experience that help me. i need your help. thanks.!!!