I do not get why there is increased reinforcement cost in the first place. The only thing it does is increasing bleed. Bleed is not a problem, the fact that units you have forced to retreat return to the field too fast, negating tactical play.
So, instead of increased reinforcement costs, why not just simply increase the time of reinforcement...? It has the same effect as delaying retreated units to return to the field, effecting you more if you loose a lot of models, but it still does give you an advantage of performing semi-hard retreats.
The increase bleed would make it hard to keep blinding charge forward. Your idea of increase reinforce time is unique. I would not mind seeing a test version to evaluate the two.

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