Rather than say “Buff Protoss”, how about some concrete suggestions?
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A Templar Archives upgrade named “Twilight Focus” that doubles the damage of Feedback (back to what it was originally, 1 HP per 1 energy). To argue the point about them killing Medivacs, this upgrade is fairly late-game because you’ll likely get Psionic Storm first, and for TvP, it gives you enough time to get Ghosts to either counter the HT in a direct battle, or to drain the energy on the Medivacs that you’re about to use for drops: [Suggestion] Feedback Upgrade
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A Cybernetics Core upgrade named “Khaydarin Matrix” that gives +25 energy to new Sentries, so they can cast Guardian Shield right off the bat, providing some softer defensive options against drops and multi-pronged attacks (difficult to use as part of a timing attack because of its expense and because it competes with Warp Gate research): [Suggestion] Sentry Energy Upgrade
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Some micro potential on the Carrier. For my suggestions, it would be to fully repair all Interceptors as they return to the Carrier, and a manual ability that forcibly recalls the Interceptors. The idea being is that you can use it in attempt to save them if they get caught in Fungal Growth or there’s a bit too much anti-air, with the obvious drawback that you lose DPS for a short while until they launch again: [Extension Mod] Dark Swarm-style Microbial Shroud (and more Carrier micro potential!)
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(Haven’t got an extension mod for this one yet) An upgrade on the Fleet Beacon named “Temporal Foresight” that increases the duration of Revelation by 10 seconds (to 25 in total), bringing it close to what it used to be before it was changed. This is designed for late game PvT where you’re facing a heavily-fortified opponent with ranged Liberators, since you practically require the Revelation/Tempest synergy to break it, but the Oracle tends to get sniped by Vikings when you cast it, necessitating the need for a new one each time. A flat energy upgrade (e.g. “Argus Jewel”) like with the Sentry is not that beneficial here, although it would allow you to plant a Stasis Ward before using Revelation and potentially suiciding the Oracle.