I don't think cloth is the best on these, a bit on the lite side ,but 1.5 oz mat is good.
I'm wondering how tight those steering
wires are pulled in that set up.
At the quadrant, just enough tension is needed to keep the steering
wire in the grooves of the pulleys and turning blocks.
Seems like the turning blocks are in pretty good alignment, if the wire isn't pulling thru the sheaves in an aligned position, or/and the wire tension is too much they could be compromised.
Loosen the wire tension and maybe that will help the breakage issue.
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SV Cloud Duster