Another possibility would be to just make EXP static across the board for both wins and losses, but keep the wolf mark penalty. Players could still rank up at a reasonable rate, but the gear would still be a bit of a grind if you aren't winning consistently. Even shortening the gap between the win/loss penalty would be a start. Maybe 30 or 40 EXP on a loss, compared to 60 on a win (solo queue, anyways.)