hey my good friend-don,t worry i love folk as much as rush or led zep or zappa !
since i grew out of listening solely to heavy music in the hair metal days of the horrible 80,s and realised that there was so much to music than les pauls and marshalls turned up to 11 (lol) i have come across so much other "heavy " music even in the folk field.
try any of the pentangle albums esp cruel sister for heaviness-you do not need drums and marshalls to be "heavy".try some peter hammill for example-his black box album from 1980 is so "heavy" that it cracks the floor yet no riffs to speak of-just very difficult lyrics and such intense delivery and playing you do not need the usual attributes for good music.
another more recent example of good heavy music is the recent trilogy of releases that interlink from opeth,steven wilson and the duo of wilson and akerfeld called strom corrosion.
all 3 albums are so heavy yet hardly any riffs or drums in the bonham manner-very english early70,s style folk type albums-yet for the acclimatised ear -so dam fine too.
try kate rusby too-if you love jones then he was a major influence on kate.love the unquiet grave on her debut album-spooky stuff indeed !
hope this helps !plus i love clockwork angels too !?!?!