Hey buddy, I have just uploaded pics of the swing weight calcualtion I just did, I tried to be as precise as possible, I took 3 times and had an average, my scale is very precise since it is made for science lab and testing, so weight is also accurate, and after all I got:
Weight: 364.2 grams
Balance: 32.4 cms
Distance from end of butt cap to hanging string: 64.2cms
and finally, the average swing time: 13.7 seconds, so according to the swing weight calculator in TW, I got a SW of 354 which was pretty close or the same as suggested before by you...
Hope this helps!