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@gbj_tester
Time to get some wider rims. Personally, I wouldn't run anything bigger than 700x32 on a rim with an internal width of 17mm. Putting very wide tyres on very narrow rims stresses the rim, makes blow offs more likely due to the direction in which the casing pulls the bead and forces you to run excessive pressure to get stability from a sidewall whose base is supported at a much narrower point than the tread width. With the exception of some mud tyres run on over-wide rims which can close up the spaces between knobs, every report I've read about by people switching to wider rims has spoken in glowing terms about the increase in stability and grip.