If you are going to continue being a pursuiter and bunch racer, I'd just go with what you have been doing. Traditional is pedal axle under the first metatarsal, as you probably know, and old school sprint lore has you wanting the axle to be in front of this. Old school. Recent knowledge indicates more power may be had if you move it back, especially if you are doing bigger gears, as contemporary lore suggests is more efficient. There's an article out there that explains this, but I feel lazy right now. Definitely for road TT's the trend has been moving the cleat back for a while now I believe, but there may be cross over for the track, and I'm a sprinter.