Can it be done?
If not, I think it maybe time to get rid as I don't fly it anymore.
Richard Debray had a go on my full sized vented matrix one time I was in Paris. He actually thought it was the dot matrix.. not realising it was the full sized version. This didn't stop him, however, happily trotting out trick after trick.
He handed it back saying.. "ah yes, good, but not precise enough in the tricks"
If you wish to backspin easier, try adding a small amount of weight to the lower cross spreader leading edge connectors.