I am not sure what the problem with the foam is, but I have the same blower with a similar hose size and I do not get the first glass of foam. I used to when I wasn't getting return airflow back into the chest but it doesnt sound like that is your problem since you can feel the air coming back into the chest.
Even though 40 is higher than the temp in the chest, I would think it is still a good enough temp for the beer to not be foamy. I doubt you could get the tower the exact same temperature as the chest since the tower is not insulated as well as the chest.
I can measure the temp of my tower when I get home if you like.
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