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Tektro M539
You need deep drop? Check out dia compe's higher tier offerings, they have a look up table on their website for which caliper requires which lever pull.
If its regular drop, just whack on some 105 7000 or ult 8000 or newer style calipers, massive improvement over older ones and don't cost that much. Fitted dozens to older style claris/sora/tiagra levers from upto 20 years old and work well. Stock shimano 55C2 or C4 pads are a bit hard for UK weather unless its summer only. Fit swissstop green or koolstop salmon and your laughing. Also don't scrimp on cables, Shimano BC9000 is a very supple and anti compression brake outer that works excellent with road caliper brakes, just don't put it on mech discs. Elvedes and a bunch of other companies do inexpensive compression-less outer with a teflon liner for only a few quid a meter. Steer clear of jagwires cheap ones, their high tier stuff is good, but low and mid is pretty pap TBH.
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BrickMan
@exteroceptive
Does anyone have insight into the performance of Shimano R650 calipers with modern STI shifters? Trying to sort the performance of a bike with a Sora ST-R3000 and Tektro M539 combo which is shite downhill or in the wet.
R650s seem well regarded but Shimano cautions against reduced performance with newer STI levers because of differing brake pull. Anyone know how it is, or if maybe Tektro R757s might be better for this case?