Using my handy bathroom scales, it took roughly 50lbs of pressure to get the oleos to move. so maybe if you land in a power dive you could get them to move a fraction of a second before the airframe explodes.
I have ordered a selection of springs from Ali Express of varying wire sizes and hopefully I can give you guys a more workable solution that results in actual functioning oleos.
I initially ordered 12mm dia. springs, but those turned out to be a fraction of a mm too large to fit. Expecting a new shipment of 11mm dia. springs any day now.