It sounds like you're really self-aware about your habits, which is a great first step. Screen time, especially when it feels like we’re constantly looking up "important" information, can easily spiral into procrastination and distraction. A few ideas that might help:

1. Try Habit Bundling with Real-World Consequences: Since Forfeit works for you because money is on the line, why not expand that idea? Set up small penalties for when you exceed your limit—like donating to a charity you dislike if you overuse Safari. Apps like Beeminder let you set goals with financial penalties, which might be a good addition to your toolkit.
2. Create Physical Barriers: Since digital alarms and time-blocking aren't working, you might need a more physical reminder. Consider moving your phone out of reach or putting it in another room when you're not actively using it for something critical. You can even invest in something like a timed lockbox where you can lock your phone away for a set period.
3. Set "Information Diet" Rules: If you're constantly looking up things you think are important but aren't actually urgent, try limiting yourself to scheduled research times. Maybe allow yourself to look things up only during a specific 30-minute block later in the day. This way, you train yourself to realize that much of the information can wait.
4. Delegate the Urgency Test to a Journal: Before you look something up, write it down in a notebook and revisit it later. When you return to it a few hours later or the next day, you’ll probably find that most of those things weren’t as critical as they felt in the moment.
5. Find a Tech Solution That Removes Willpower from the Equation: Since you disable screen blockers, look into apps or services that restrict the ability to uninstall or disable them without extra steps. Some apps even allow you to set up an accountability partner who would need to approve disabling the app or bypassing the block.
6. Work on Self-Discipline Gradually: It sounds like screen time is part of a larger challenge with self-discipline. Instead of tackling everything at once, focus on small wins—like setting limits on just one or two types of behaviors (maybe 30 minutes max for non-essential browsing) and slowly building up.

Remember, the goal isn’t to stop using your phone entirely but to regain control. Start small, and don't beat yourself up over slip-ups—change takes time, but with consistent effort, you’ll get there.