It seems like everyone is focused on the clinical/counselling programs in this thread but I'll try to give you a little insight. I'm from the east coast so I'm not too familiar with the faculty at UBC, but I'm sure all of that research experience would make you competitive, especially for an experimental program.
For School Psych I'm guessing it would depend on how much UBC weighs research experience. I'm sure it matters, but for instance I have less research experience than you and have gotten into two School Psychology Masters programs. Mind you I did have a fair bit of experience working with youth. At the end of the day it's all a crapshoot and depends on who else applied and their backgrounds. Look at the results board and many highly qualified individuals get turned down across all programs every year.
Any reason why you are only considering UBC? Research fit?