try this alternative booster oil -- use oil that you can buy from hardware. the one i bought was an oil for sewing machines at 100ml then mized it with 10-15ml paraffin oil....
Stretching the rubber will not increase its performance. It is by increasing the sponge capacity to transfer energy and lessen energy loss. This can be achieved by boosting.
Force pro black edition is more of a speed and it is stiff. Spinning and control would be a adjusted to it. Go with 5 ply off- blades like Stiga Azalea Off and Xiom Offenaive S.
They just are worlds apart and they feel different. However, carbonado 90 seems to be good for shortpips also since it is medium hard and a bit harder than clipper cr.