my case is same with yours, but PR appication is case by case,and depending on how luck you are, just provide my opinion for u:
1.applied for PR with the chinese Master's degree, which is the highest degree now.
2.mentioned the Ph.D(pending), just filled in the education experiences page.
3. didn't submit the PR invitation letter from ICA, since i havn't got the local degree.
4. asked the company for sponsorship,(the most important factor), they can provide the salary information for ICA,so payslip can be ignored sometimes.
in addtion, if your company is Famous, your salary is a little bit above-average, and your position is desired in SG,or even If your are a single lady, (all of them are value-added factors), just try it.