Alan - previously we have spoken at length on this and discussed how graf was better suited for the movement of the holders. I had some success with this but it is not the panacea one expects it to be. I have done some ongoing work with a couple of students who are doing masters / doctorates in this field and have learnt that pronation has many causes and effects, resolving it in a ice skating boot requires a multi phased approach - orthotics, boot fit, blade alignment, body alignment, exercises, strengthening programs and stretching. For example: putting a wedge in to get cog may help you whilst you are standing upright in a neutral position on the blade but as soon as you go into a turn and if the boot fit is not right the foot can collapse and roll in the boot. This leads to a loss of power in the turn, loss of edge or the catching of an edge as you transition from one edge to another coming out of the turn because your foot has now moved in the boot.
My suggestion would be to go see a sports podiatrist who has experience in working with ice skaters. NOTE - "experienced" is the key word here and you will need to ask some hard questions before you consider seeing someone and paying them for their time and expertise. The aapsm organisation would be a good start and their web site (www.aapsm.org) has a list of members located in Canada. You may know of other organisations who offer similar expertise. The downside is the cost, it is not cheap to see these people and get orthotics built and if you live remotely it is even harder. But I think that seeing someone skilled in sports podiatory, explaining to them the problems you are having, working with them on your current skates and a long term plan (or short term if your current skates are found to be a poor fit) to get into a pair of VH skates (for example have them build lasts for you that VH build the boot from) would be the best value money you can spend if you want to continue skating.
This is a good article on pronation in skates and how some of the issues were addressed: http://www.aapsm.org/pdf/humble-skatinga.pdf