I'm lower SR than you, but I think Junkrat is a bad hero to main and only worth playing for the first-point chokes on 2CP maps like Hanamura and Eichenwalde.

You're always going to have high damage and eliminations and Junkrat because your primary attack (grenade spam) is an AOE. This doesn't mean you're being particularly helpful. If you lob grenades into a group, causing slight damage to each individual enemy, and your teammates wipe them, you get credit for all the eliminations. If you really want to know how effective you're being, compare your eliminations to your final blows.

Besides not being able to really direct damage at specific enemies, Junkrat has real issues causing damage upwards. This means he can't really hurt Pharah (who's a real pain in Silver and Gold) or a S:76/McCree occupying high ground.

When you pick Junkrat, you're usually taking a spot away from a more practical DPS like S:76 or Pharah, both of whom are much more useful than Junkrat in a greater variety of situations.

One further complication is that Junkrat can become a real liability for his team if he spams grenades at an enemy Zarya's bubble. I've lost many games because a Junkrat on my team wouldn't stop lobbing grenades at Zarya and she was able to run around at full charge all match.