I don't think it's a balance so much as the two fuse into something different from either the typical NF or 8 personalities. Both NF and 8 are missing typical elements and both have certain elements strengthened when combined. This is likely because of how both types are typically associated with certain Enneagram and MBTI types which flavor their descriptions.
INFJs are usually 9s or 4s
INFPs are usually 4s
ENFPs are usually 7s or 2s
ENFJs are usually 2s
8s are usually ExTJs or ExTPs... so descriptions will usually be a little flavored by this.
Combine atypical combinations of MBTI and Enneagram and they're going to manifest in atypical ways. MBTI type creates perspective. Ennaegram creates motivations. The motivations for Enneagram type will always be tainted by the perspective of the MBTI type and vice versa.
However, I will agree that NFs and type 8s do tend to have a lot of inner conflict between 8 motivations and NF perspectives.
INFJs are usually 9s or 4s
INFPs are usually 4s
ENFPs are usually 7s or 2s
ENFJs are usually 2s
8s are usually ExTJs or ExTPs... so descriptions will usually be a little flavored by this.
Combine atypical combinations of MBTI and Enneagram and they're going to manifest in atypical ways. MBTI type creates perspective. Ennaegram creates motivations. The motivations for Enneagram type will always be tainted by the perspective of the MBTI type and vice versa.
However, I will agree that NFs and type 8s do tend to have a lot of inner conflict between 8 motivations and NF perspectives.