Nice graph!
I assume that the x-axis is time and the y-axis is dopamine levels. If so, I think its pretty accurate.
It which case your question should be about finding your comfort zone. You know you can always escalate, taking greater risks and sacrificing your male side, to elevate your dopamine levels. However, can to be comfortable with lower dopamine levels. Yes, I think so. Even while your dopamine levels are important for experiencing the thrills, and emotional rush, and sexual gratification, etc... there are other neurotransmitters involved in cross-dressing. One important neurotransmitter is oxytocin. Your oxytocin neurotransmitter is associated with the feeling of comfort, love, and bonding. Even while your dopamine levels will decrease you can still enjoy your oxytocin. I believe this is where you will find your comfort zone.
Just limit your cross-dressing in accordance with your needs and your wife's tolerance. Your wife will gain a sense of security and you will find your comfort zone... Yes, this does mean sacrificing some of the dopamine excitement.