L1, L2 Visa

I went to three counters first and last fourth counter for interview.
Counter2: (1st building)
Vo: Asked my DD, passport & I129s,I797 docs
Me: Given
Vo: I do see the YYYY company in I129s, YYYY X company in I797 both are different?
me: YYYY X company is my parent company, recently YYYY X company acquired YYYY X company.Petition filed by YYYY X company & petition payment done by YYYY X company.
Vo: ok and again asked r your company having BEP, if so please give the letter?
Me: YYYY X company have BEP but YYYY X company don’t have this because full integration is not done between b/n YYYY X company & YYYY X company.
Counter6:(1st building)
VO: asked my left hand 4 fingers print and asked passport,I129s,797s checked & done:
Vo: asked to follow next building for next process
Counter5(2nd Building)
VO: Asked my DD,passport & I129s,I797 docs
me: Given
VO: Given CASH receipt for the DD provided and said wait for counter no# for Visa interview.
Below are the VISA questions i faced during an L1 B interview at US Consulate at Counter19-last counter(l2nd building)
Me: Good morning with smiley face
VO: Very good morning
VO: What is your company's name?
me: YYYY X company- a Computer science company
Vo: What is your indian salary in lakhs?
me : YYYY Lakhs/annum
Vo: Who is your client?
me: United airlines. Said about this in brief(3-4 lines)

Vo: What is your Specialisation?
Me: Having experience in development of Data generation(DGEN) tool,this tool is a YYYY X company own properitery tool which is used to create test data(Flight tickets,PNRS,etc) for mobile applications project by interacting with Apollo GDS(global distribution system),CIDB databases of United airlines. ----------- i explained about this tool in brief

Vo: Any certification/documentation to support this tool?
me: This tool is a in-house training,properiatry tool of YYYY X company, no formal training for this tool but in L1 documents showed clearly justified specialized skill is mentioned and i showed that docs.
Vo: He observed that docs, watched computer screen (maybe he compared or not) and said your VISA is not clearly approved?
Me: I am trying to convince him .....labla lablaaaaaaaa
Vo: Ask your HR to file another type of VISA & returned I-129S with "Not clearly approvable" stamp, returned the passport
Me: Thanks (with sad mood in heart) :( --- I supposed to say happy Christmas to him but I am not 
Suggestions:
1. Be confident & eye contact should be maintained with VO officer
2. Don’t prepare too much & go like a cool guy
3. Don’t expect 100% success rate ,pray to GOD along with your confidence
4. DEfinetly luck also a success factor for this type of US visa’s