Purely from my lineage perspective so if your values and traditions don't mesh, that's perfectly fine.
If I concentrate on something I can either suppress it or send that energy into it.
You're getting bogged into mental conceptualization. There are several traditions out there, but the emphasis in the beginning are tantamount:
1. Healthy body
2. Balanced flow of energy
It's point number 3 many tend to forget. There are a myriad of different sensations in the body and the mind wants to attach to. Anything from this sensation or that sensation. The purpose isn't to necessarily focus on the feelings of energy per se, but to be aware of them since they really don't end even when your mind attempts sustained focus on a point (in fact they magnify). But your primary goal should not be to move beyond that point of sustained focus and concentration.
In this, does it really matter the game of sensations the mind is playing?
To further this point I want to go back to something else you mentioned that I touched on before:
Often when I sit in meditation after I've passed the initial stage of adjusting my posture and relaxing my muscles for 5 or so minutes I often start to feel pulsations of energy rush over my body, rising up my spine then gradually falling down my chest.
When beginning meditation, there are a lot of sensations. What is to say the thing that's flowing isn't phlegm, dampness or something else indicative of aggressive yang?
When there is a totality of relaxation, there is really nothing like it. Sure the sensations and things are still there, but they also do not matter. Relaxation is a multidimensional approach. When you are relaxed:
are all relaxed.
A good example of this in standing meditation is an old saying that we used to state. If you're shaking, you're still not relaxed. When you're relaxed, the shake is minimal, almost non-existent. Your body is sustained and upright because it is effortless. The body tends to automatically correct itself and further the body is FULLY supported.
Internally, you still have a lot of sensations (e.g. I feel like I'm sitting or I feel a push / pull in my arms / legs). These aspects, while good checks of relaxation, should not be attached to. Sustain your focus.
I highly urge you to actually enroll in the below class if Kundalini is your thing:http://kundaliniawakeningprocess.com/
I've heard of a lot of success stories of the controlled process and also emphasizes similar aspects that my lineage adheres to.
The pantajali sutras is also a good read for anyone interested in meditation. But ultimately, don't focus on it. Sustain focus. And kundalini comes. It's literally an outgrowth on right concentration (or sustained focus)