Adding amaroli has helped me. That's not for everyone. Or maybe you already do it...
Also something that helps me is smelling a slight fragrance. I have a frankincense and myrrh spray, and I spray a little of that on my thighs and knees...so when I'm doing asanas I smell it and begin to become relaxed and absorbed in thought. I don't spray so much that it would distract me during meditation, or irritate the nostrils during pranayama. In my opinion, most incense would be out of the question.
Also, time. It takes time to become proficient at meditation. In yoga we are uniting the two opposing forces within us...so when we get closer to union and we are more balanced, morning meditations and evening meditations should be more similar. All day long we should begin to have the same calm and present state of mind, instead of rushing in the mornings and slowing down in the evenings. So it takes patience and dedication.
Also, performing a relaxed and natural version of alternate nostril breathing before spinal breathing is good...I do that. By the way, I don't know what's recommended in the big AYP book for alternate nostril breathing, so you may want to check there first to see Yogani's recommendations.