Help me improve my OU stall team!

Question

Mew @ Leftovers
Ability: Synchronize
Shiny: Yes
EVs: 252 HP / 104 Def / 152 Spe
Impish Nature
- Taunt
- Soft-Boiled
- Will-O-Wisp
- Knock Off

Stallbreaker
Taunt and Will-O-Wisp to force set sweepers to switch, and to get more residual damage from dem burns. doe.

Heatran @ Air Balloon
Ability: Flash Fire
EVs: 248 HP / 6 Def / 252 SpD / 4 Spe
Calm Nature
IVs: 0 Atk
- Stealth Rock
- Lava Plume
- Roar
- Protect

Rocks and Roar.
I will almost always lead with Heatran to get the Rocks up ASAP.

Sylveon @ Leftovers
Ability: Pixilate
EVs: 248 HP / 232 Def / 28 SpD
Bold Nature
- Hyper Voice
- Wish
- Protect
- Heal Bell

Cleric
Hyper Voice is incredibly strong even without a SpA investment, and you gotta have a Cleric in stall team, yo.

Tyranitar @ Choice Band
Ability: Sand Stream
EVs: 252 Atk / 4 Def / 252 Spe
Jolly Nature
- Pursuit
- Crunch
- Earthquake
- Stone Edge

Banded Pursuit trapper
Provides attack coverage this team desperatly needs, with ridiculous power.

Gliscor @ Toxic Orb
Ability: Poison Heal
EVs: 244 HP / 192 SpD / 72 Spe
- Toxic
- Earthquake
- Substitute
- Protect

Toxic staller.
Ground and Electric switch ins.

Venusaur @ Venusaurite
Ability: Chlorophyll
EVs: 252 HP / 240 Def / 16 Spe
Bold Nature
- Giga Drain
- Sludge Bomb
- Synthesis
- Toxic

Role? MVenu doe.
Before you say Synthesis is useless with TTar, but i only use TTar in the last couple of turns anyway, so it's almost never a problem. Also, Toxic.

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I've laddered a bit with this team and i've noticed one small-big problem. MPinsir.
So remember that when answering.

Comments

For MPinsir you could try a physically defensive Zapdos.

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Chansey > Sylveon. Sylveon sucks ass and gets pressured way too easily, since it's the same a Clef (would probably be another great option), but without the Magic Guard to ensure it can switch in without taking 12%.

ScarfTar is another Altenative, specifically with Ice Beam, as it kills Pinsir, Pursuit traps, and OHKO's landorus, the almighty stallbreaker.

SubToxic Gliscor sucks ass yo. You need roost up in that b.
Roost > Protect
Knock Off/Taunt > Sub (allows Mew to Defog [stall needs to rid of Hazards], and Gliscor is speedy, meaning it can stop opposing stall as well)

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Leboss, Chansey lacks defensive bulk, even with Eviolite.
Ill give those TTar and Gliscor sets a go. Thx bae.

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Water weakness tho, some pokemon like Keldeo and Crawdaunt can become an issue.

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Chansey, although having low physical bulk, is still superior to Sylveon. Since MVenu beats almost every Knock Off user (bar Torn-T and Lando), it really has nothing to fear when switching out. Sure, Goth can trap chansey, but with smart double switching, TTar should help with that Goth problem easy.

If anything, at least try Clefable > Sylveon. Being able to tank Hydro from Gren, TBolt from Thundy, and Psyshock from Lati, it is a great mon to have. And due to the majority of your team having recovery, you dont really need wish.

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Wish provides recovery on the switch, and my team is pretty slow.
Hyper Voice goes through subs and if i use Clefable i would have nothing for Kyurem-B.