Even a person with scruples is bound to obedience to the Catholic catechism, which states: mortal sins must be confessed by name and number.
The Catechism says if you forget a Mortal sin or to mention the Number of occasions of that sin, you are absolved, but MUST mention it at the next confession.
The OP said he wishes to be obedient to the Catholic Catechism rather than to any other source.
(Unfortunately, there are some priests who do not teach what the catechism states; and who support gay marriage etc). One must always check that what one’s confessor says is compatible with the Magisterium of the Church (St theresa of avila and St Faustina both said this, and that they had experience of confessors saying something was good that was actually a sin),
The OP never said he was scrupulous either.
And you are saying the Catholic Catechism can be disobeyed by scrupulous people? Where does it state that in the Church Magisterium or Catechism?