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The secret lies not in the disc but the shot. Any disc which flies basically straight for you is fine.
Since you have not been exposed to a steady diet of long , tight tunnels it will take practice to learn the shot. You could buy a box of new plastic and not be any closer to mastering the shot.
Find a hole which exemplifies the challenge you described and spend an hour just practicing drives on it. Return the next day and do it again. Return the next day and do it again. Within a few days you will be vastly better at the task. BTW, you will encounter this particular shot many times on many courses.
There is a hole on one of my home courses (#1 Hudson Mills Monster) which is near impossible for my drive (RHFH). I have practiced it for hours and hours, doing nothing more than unloading a bag full of drivers, picking them up and doing it again.
If you already own a disc that turns over predictably and doesn't fade at the end, try throwing that with the hyzer release. You are not throwing a hyzer shot, but a straight shot with a hyzer release angle on the disc (the inside edge of the disc tilted down for RHBH- /).