reetake gmat? 680, WL by Wharton/Duke

[chiyuanl]

Hi
I am in the middle of application process and urgently in need of your advice on my next application strategy.

Here is my background:
1) Taiwan; G:680 (M:88%/V:70%/AWA:5.5); T:103; GPA:3.4 (Major: Economics + minor: Biz administration)
2) W/E: 1.5(army)+ 3.5 IT consulting - from project manager to business development manager / worked and lived in 5 emerging countries of Asia
3) Applied R1: Wharton/Duke/Kellogg/Cornell(R2)/NYU
Result:
WL - Wharton/Duke
Interview (no decision yet) - Kellogg
No result from Cornell/NYU yet.

Since I got WL by both Wharton/Duke, I am wondering whether my GMAT is the bottleneck in my application? However, I took heavy quant courses in university and 2 recommenders are all Indian who talked a lot on my ability to work in English environment.

Do you think I should try more schools in R2 or just focus on retaking GMAT? If try more schools, should I try other 1st tier schools or 2nd tier schools?

PS: I took 4 times GMAT. The latest score is lower than the 3rd.

Thank you!