Once we have a schedule, the next hurdle is perseverance. There are a thousand reasons why prayer will seem tiresome, unproductive, less-than-optimal. Resist such thoughts. You made the choice to pray (and yes, it was a good choice). You thought it through. You came up with something that works for your schedule. Now stick to it.
A bit of energy is helpful. So is refusing to give ground. When the first thought of "maybe I should be doing..." arrives at the doorstep of your heart, throw it out. You have made an amazing choice, rational, reasonable. Be firm. The other things are just temptations and distractions.
Rhythm, routine, going deeper...these things are essential for a deep and stable life of prayer. Coming close to God is like any other relationship, worthy only in the long haul. So fight the good fight...with energy.