I am trying to remember whether Shimano improved the roller brake during the lifespan of the Torq. I think that the heat dissipation was improved with a bigger cooling disk, and maybe some other bits.I was fortunate in not having the front brake problem on my one, possibly through retensioning and truing the front wheel at the outset. Like you I rely on the front brake most and am happy with light rear braking, but it's the lack of a direct and immediate relationship between input and braking I dislike. I like the relationship to be precise.
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Returning to the ProConnect, I was always surprised that there is no provision in the frame design for using disk brakes. So although the 8 speed Nexus hub can be switched to the 8 speed Alfine (which can take a disk), there is no provision to fix a caliper.
In changing to a 36 spoke hub, I have stuck with the Nexus family that can use the roller brake. As yet, I still use the standard Deore rim brake which works fine.
James