You are awesome.
If you want an *EXACT* answer to your question, go to https://www.willswing.com/polar-data-fo ... g-gliders/
(or get the polar for your wing, realizing that your conditions will be a touch different than factory configuration)
Put a point on the graph for your current wind conditions (down for sink, up for lift, left for tail wind and right for head wind) and draw a tangent line to meet your glider's polar curve. That will give you the speed you "should" fly.
As you can imagine, this does indeed suck all the fun out of flying. Some people decided to put this data into flight computers. That sounds GREAT! but your conditions are constantly changing (as you well know) so you compare the speed to fly with your measured wind speed...... and suddenly you are looking at gauges instead of flying your wing.
*MY* solution, find three points on the curve you like.
1) "I Love This Air" speed, that's the horizontal part of the polar. (about 25 mph for a U2) Get a feel for the bar pressure (or flap markings on a rigid) and learn it.
2) "Just cruising" speed, that's about the tangent line from your origin (30-35 on a U2).
3) "This sucks" speed..... take a tangent line from the worst-gust conditions you think you'd ever want to fly in. (45 and looking for a landing spot damn near straight down if it is a headwind).
Then I just have 3 basic options to build off of while still focusing on flying. That is *MY* balance between science and fun.