Snap, top end rebuild from base gasket up , + new cam chain, + new clutch parts also 8 grand thereabouts. Had a spanner on the crank for a valve check this week .... oh so THAT is how the compression should feel

!!!!!!
Going back to carbs though , thanks to Derek at Motolab in California, I have brand new plastic slide guide, and plastic slide , en route, if your slide and slide guide are worn , any carb fixes you make will not last, soon it'll have needle/nozzle wear and you are back to off-idle-rich-bog-city.
I also intend to block one of the two slide holes to reduce slide flutter, and therefore wear. The 96+ DR's have one hole for a reason !!!
The two holes / premature slide wear , is a known old-DR issue , Motolab says. Very much so for those with a high in-traffic usage.
IMHO, to enjoy an old thumper to the full , the carb must be cock-on. These DR's are infamous for Sudden Death, it need not be like that ... thanks to Derek Capito , parts not even listed in the microfiche can be obtained !
When I've got it all on the workbench, I'll detail the Before and After to share my learnings , ... if there is good value in attending to this level of detail.