My current definitions of the rays and their blockages

[Plenum]

I think that perhaps the word blockage here (in Ra's sense) could possibly be synonymous with the word 'absorption'.

When I hear the word blockage, I had associated it with something like a water pipe, and water flowing through it. This is perhaps the wrong image to be using. After all, we are dealing with 'light' here in the energy centres.

If we switch out the notion of 'pipes' and 'water flow' and use a more accurate model of a current of light, then a blockage would be seen/experienced as absorption of light. Absorption here being negative-oriented patterns, which even a positive entity will exhibit in some degree.

for a fully activated entity:

54.31 that in the fully activated entity, only that small portion of instreaming light needed to tune the energy center is used, the great remainder being free to be channeled and attracted upwards.

the less absorption there is of the 'upward streaming light' then the brighter each energy centre will be.

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so indeed, here the absorption of light will not directly lead to ill health, as we are just talking about the usage of light. As referenced by Austin and anagogy, the ill health and disease comes about through non-efficient use of catalyst, which plays out in the body like a feedback mechanism; with physical conditions quite often (almost always) being representative in a poetic sense of the way the catalyst is not being used - ie Don's sore back representating him not wanting to carry that which needed to be carried etc.

61.7 In the questioner we may see the desire not to be carrying the load it carries given as physical manifestation of the soreness of those muscles for carrying used. That which is truly needed to be carried is a pre-incarnative responsibility which seems highly inconvenient.

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also, by throwing out the model of pipes and water flow, and using the light/absorption/transparency model, one is able to work on higher energy centres without previously engaging in the preceding ones.

41.19 Each energy center has a wide range of rotational speed or as you may see it more clearly in relation to color, brilliance. The more strongly the will of the entity concentrates upon and refines or purifies each energy center, the more brilliant or rotationally active each energy center will be. It is not necessary for the energy centers to be activated in order in the case of the self-aware entity.

Thusly entities may have extremely brilliant energy centers while being quite unbalanced in their violet-ray aspect due to lack of attention paid to the totality of experience of the entity.