Use 'only too' to stress a positive reaction or willingness.

Positive Emphasis

Avoid 'only too' in simple situations. It's for emphasizing strong emotions or reactions.

No Overuse

'Only too' is sincere, not ironic. Using it sarcastically can confuse.

Use 'only too' to admit a negative or problematic situation.

'Only too' prefaces facts that might not be pleasant to acknowledge.

Use 'only too' to convey strong personal feelings about an extreme situation.