Please comment on my DEFINITION of OT TC Methodology. Is it sound?, comprehensive?

I defined six steps in OT TC methodology in my MPhil thesis as follows:

1.7 Methodology
I used Old Testament textual critical methodology. This methodology consisted of six steps as follows:
1. Firstly, I compared the MT and LXX OT quotations.
2. Secondly, I noted the differences between the LXX and MT OT quotations.
3. Thirdly, I examined additional witnesses to the OT texts such as the relevant DSS texts and the GNT quotations to find out whether these other witnesses to the OT supported the LXX quotations or the MT quotations.[1]
4. Fourthly, I reviewed literature specific to the LXX/MT verse differences in question to find out what other writers had said concerning specific verse differences between the LXX and MT reading of the same text.
5. Fifthly, I recorded my conclusions, i.e., specific conclusions for each verse where the LXX text differed from the MT text.[2]
6. Finally, I recorded my recommendations; i.e., specific recommendations for each verse where the LXX text differed from the MT text.

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[1] One criticism of the thesis reads as follows,

“There is a lot of material in the thesis, but it has not been arranged properly so as to respond adequately to the topic. I get the impression that the topic is too wide and so there is imbalance in the presentations, particularly between the LXX and MT on the one hand, and the Hebrews Texts and the NT on the other hand. Looking at the parts on the Hebrews and NT, it seems inadequate and has not been well-integrated into the latter (i.e. the LXX and MT) part of the thesis.�

My response to this criticism is that this thesis is actually a thesis based on Old Testament (OT) textual criticism (TC); and so it is focussed very clearly in the Old Testament, specifically on the differences between the LXX and MT. However, the third step in my OT TC methodology demanded that I examine other witnesses to the variant Old Testament texts. These other witness to the OT were not limited only to OT witnesses such as the dead sea scrolls, but also included New Testament (NT) witnesses, and specifically for this thesis, the Old Testament quotations found in the Greek New Testament (GNT) book of Hebrews; and so the role of the New Testament witnesses, particularly the OT quotations in the NT book of Hebrews is simply as a witness to find out whether the quotations in the GNT book of Hebrews matched the LXX or the MT quotations.

I recorded my findings in Chapter 4.

[2] Conclusions included an explanation of the differences between the LXX and MT texts for the same OT verse and a hypothesis of what the original autograph text might have read.

I WOULD REALLY APPRECIATE YOUR COMMENTS ON MY METHODOLOGY.

Is it a sound methodology?

Is it comprehensive?

Many thanks.

Philip Engmann.