I reckon take some angle off your back foot - it'll give you a more one directional stance (ie you won;t be able to ride switch so well), but as you're doing 1 directional riding it won't matter. What I feel is that it might help you bend your (back) knees a little more naturally.
To engage the front foot more just lean a bit forward and put some more weight into it. It'll feel funny at first - really daring! - but it's the way! It'll help keep your shoulder line parallel to the ground (which you want in all situations).