2005 R1200RT Misfires at high throttle

Wow ... what a puzzler ... 2005 R1200RT begins to stall and sputter whenever given about 3/4 to full throttle, very frustrating! ... myself and local dealer have checked the obvious suspects:
1. Air intake obstruction
2. Drained fuel and replaced with fresh
3. Swapped fuel injectors with known good ones
4. New spark plugs
5. Swapped ignition coils with known good ones
6. Swapped with known good fuel pump and fuel pump electronics
7. Checked cam position sensor
8. Adjusted valves
9. Adjusted throttle body sync

Can't figure out why this bike is acting this way ... has anyone experienced this issue? ... could sure use some experience here ... thanks!!
John

Blocked fuel line, can be either inside or outside the tank

Blocked exhaust

Blocked vent line to the gas tank, causing a vacuum which then inhibits fuel flow

Blocked or wet charcoal canister or the lines to it

Cracked vacuum line, allowing too much air to be sucked in

QUESTION: When this happens, do any of the lights or instruments flicker? That would indicate an electrical problem - flaky battery, loose connection, etc.

It sounds like a blocked fuel filter to me. More or less a classic symptom.

The problem is resolved. After taking the bike back to the dealer, and putting another 8 - 10 hours of troubleshooting into it, it was finally discovered that it was actually both coils (not sure if primary or secondary) that were intermittently bad. So, originally swapping out one coil at a time to troubleshoot the problem was not adequate to isolate the issue.