First of all I am not an expert, I have just shared you my knowledge that I gained from different sources. Actually they considered a job full-time when the weekly working hour is 37.5. and the equivalent part-time on that basis. As you mentioned your part-time work was 30h/w, so that might earn more points for you than general concept of 20h/w part-time work. Moreover, if you calculated your experience at the time of application, it may lengthen now, because the vo calculate the year of work experience when they process the application. Information regarding this on their website are as below:
Work experience (Maximum 21 points)
You will earn points for the number of years you have spent in full-time (37.5 hours per week, or the equivalent in part-time), paid work.
Use the chart below to calculate the number of points based on your number of years of experience.
Experience Maximum 21 points
1 year 15
2 years 17
3 years 19
4 years 21
I have a questtion regarding your language test result. Are the points you shown in your initial application is different from the test result? If it is same , dont worry.
I submittedinital application in Nov09 and received doc req in Jan10, and submitted full docs in Apr10 and got AOR in the same month. Till now Received by visa office.
I think the processing now is going very slow.