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My only recommendation is to get a professional shop to arc the shoes and install new springs. I had the hub on my 4LS turned ever so lightly on a big old lathe to true it, needed next to nothing. The same shop made new linings and arced the shoes. I trust the V7 Sport brake in any conditions.
Are these new springs that are breaking or used originals? I haven't had any problems with breaking springs, but then I only reuse the originals if they "ring" when dropped onto the floor. Perhaps Harper's has some new-old-stock? Might be worth checking.
No more hassle of using a vice grips and other half-assed tools to remove and install the brake shoes, at least. Made this spreader tool the other night.