Before you spend money on parts, Check your flexibility, I and others spent a lot of time and money just to find out it was a mobility issue. Mine ended up being an IT band needing strectched. 3 minutes of pre-ride appropiate stretching allows for hours of pain free riding. The first thing all four of my bike fits did was check my mobility, Identify issues, then consider those thru out the fit.

I am 104kg (I think - 230lbs) 6'4" tall. All my fits have had longer stems and seat about centered on the knee. For about 9 years, I have found myself moving my seat forward to raise my chest from the professional fit results. I had a fit by a physical therapist last year due to knee pain. He sugested I move my stem from a 110 to 90mm to help with the IT band and knee pain then move back to my 110mm when pain is gone. The issue was stem, not saddle related. Actually IT band at the hip. I have since decided 100mm inverted with 6° of rise is my new stem length for comfort. This took a lot of miles to do my self. Could have gone to the fit studio and figured it oout in a 1 hour follow up session. Hope this is helpfull

This response is based on you needing to match the two bikes and not accept the less than optumal position on the indoor bike. Last year I went out of my way with a laser, 4ft level, & metric tape measure to make my indoor bike match my ourdoor bike fit. I had the measurements from the fit, however, because the frames were so different, I had to use tools to determine what stem & fore aft was needed. I also bought the same seat (lower level same shape, $400 is too much for an indoor bike). It made a huge improvement. I also helped a few others with these tools for the same, then bought used stems to match the position. They now suffer less on four hour trainer rides. There is a tool called duplifit (https://archdesignwork.com/products/dupli-fit) that helps, but in my opinion, a long level, self leveling laser, & metric tape gives you numbers to reference instead of a point in space.

This is a great topic. I look forward to the responses. I have found KOPS is how I ended up after being fit each of four fits, however, I am more comfortable with knee in front of spindle. I find my self resisting moving the saddle forward.

I have found that most webinars fall during the times I ride. I would typically end up watching the video after.