I'm not an RAAus instructor, just a pilot. My take is approach keeping best height until within glide approach; you can scrub height at lateish final with side slip. Long shallow approaches are not allowing for an engine issue. If circumstances are that your low and have an engine issue or failure, have alternate sites (best options) to land picked all the way in and don't ever think you can extend the glide. Not meant to be instruction just my methods. It's a bit like fighting a fire what you see; is what you have to deal with using your training, equipment and experience, their all different to some extent.