Rather than outright giving them both both effects, I believe it should work something like this:
Shields are given both Daze and Stun, but the Daze is longer than the Stun. For example, normal shields would have say, 3.5 Seconds of Daze, but 1.75 Seconds of Stun.
Quivers are given both Slow and Paralyze, but the Slow is slightly longer than the Paralyze. They should also have varying times much like Trap. For example, while Elvish would have say, 4 Seconds of Slow, but 3 Seconds of Paralyze, Magic Quiver would have say, 2.5 Seconds of low, but 1.5 Seconds of Paralyze.
As for UTs, I can suggest this:
- Scutum gets no changes. The inability to Daze would make it even more distinguished.
- QoT gets a small Stun coming in at 1.75 Seconds and nothing more.
- Beehemoth Quiver gets a small Paralyze of 1.25 Seconds and nothing more.
- Snakeskin Shield gets only Daze and no more pierce, but for an increased duration. This would make it an actual UT.