Put my snow tires on the other day and the tires would chirp with very light throttle input on dry pavement and a little greasy in the wet. Thinking about it I've never had traction issues with Toyo tire in the last 20+ years but the GO-2 was not available in a 205-55-16 so was the first time running on a Garit KX so just assumed the traction issue was related either the new car or different model of tires or both.  Never thought to look at this before even though I am in the industry. 
O.E tire have a load rating of  89 and inflation @32psi . Snowtire are a 94 XL (extra load).  Consulted several tire manufactures load rating charts and came up with the following pressure adjustments 
Load Rate  89 = 32psi on '09 Vibe
                94 = 30psi
                94XL = 27-28psi
			
			
									
						
							