I’m glad you’re still doing Bikram! In time the mental effects will become more obvious to your awareness — though I’m sure the yoga is having effects at that level already. For myself, the discipline of the set sequence has had tremendous mental value because it lets me detach from the grasping attitude that would sometimes come up for me in other yoga classes (“let me see if I can do this new weird/difficult posture”). Like the t’ai chi sequence of forms, the sequence is part of the meditation.