Can't help you right now with slip %, my weather station is in the work shop, but, did you get the Hal valved QA1's for the front? They seem to have completely cured the wheelstand problem I had. Time will tell, when the super air rolls around, but, I only got about 2' for 25-30', and that was in DA of 2300'. Normally, it would be 4'+. You may want to call him!