You should have 102 energy after completing all scenes that give energy.

Usefull energy requirements:

36 Studios
10 Practise of best girl
25 Coaching
2+ Money

If you do resets you do not Coach. Also, if you do resets, you do not need much money. So Coaching and money goes into skills. After completing the last girl, you do not need much money.

The only time you crave for money is, when you attempt to complete the last girl. Leveling buildings only gives about 3% and is capped at 50. So you want to shell out 52 energy for the best three buildings. With 1 skill for 5 and 10 for practise and no coaching you get to 103 - so no filming in the cheapest studio and you can have active: 5 studios, 1 Practise, 3 best money buildings, 2 skills.

You might save up money for the next girl to be released, but it is to be expected, that warp max will be raised again.

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I do not want to say energy blocks for diamonds are useless, but there are limits. There are only 10 skills, there are only 6 studios, the best money buildings outshine the cheaper ones, practise for several girls is useless, you have no big benefit of coaching several girls because the rare girls in challenges are still rare...