[RMT][OU]Sweepers.team - help is greatly appreciated, still kinda new

I've just recently hit the mid 1400's with this team and have been very happy with that progress. I feel like it can go higher but tentacruel and my mega keep changing and I haven't found a super happy fit yet. I've gone through mega medicham, loppuny, both charizards, altaria, and maybe some others I'm forgetting and haven't been super sold on any. I'm currently on mega gyarados and he's been performing decently well, so might stick with him for awhile. The team is straightforward. Get up veil and set up a sweeper and fire away. If sweep dies, reset veil and repeat. Most of the EV's were pulled directly from smogon because I don't really know how to calculate the most efficient stats for my team. Anyways, here's the team...

Magnezone @ Choice Scarf Ability: Magnet Pull Shiny: Yes EVs: 4 HP / 252 SpA / 252 Spe Timid Nature IVs: 0 Atk - Thunderbolt - Hidden Power [Fire] - Flash Cannon - Volt Switch

Fairly standard magnazone trapper who can also revenge kill decently. I've been very happy to throw this in front of celestela, opposing magnazones, ferrothornes, etc. I wish he would do better in front of magearna and heatran, but maybe I'm just using him wrong in those situations (a heatran recently 1v6'd me...). I'm pretty happy with how he's been performing.

Ninetales-Alola @ Light Clay Ability: Snow Warning EVs: 248 HP / 8 SpA / 252 Spe Timid Nature IVs: 0 Atk - Aurora Veil - Freeze-Dry - Hypnosis - Encore

My main lead. I really enjoy this set. Basically auto freeze dry t1 into either encore if i outspeed and they are trying to set up or hypnosis to force the swap. Aurora veil is bonkers. Vs rain teams I lead with magnezone, though, to kill an opening ferro or swap to ninetails to remove rain t2. Freeze-dry does a solid amount of damage to lando-t and can be used to finish off mons.

Tapu Bulu @ Meadow Plate Ability: Grassy Surge EVs: 252 Atk / 4 Def / 252 Spe Jolly Nature - Swords Dance - Horn Leech - Zen Headbutt - Stone Edge

First of my sweepers, tapu bulu has proven to be a beast. Aurora veil into sd and go ham has won me too many games. The main thing I'm concerned over is zen headbutt/brick break/superpower and it's held item. Was debating about swapping that to life orb or maybe a cure status berry.

Tentacruel @ Black Sludge Ability: Liquid Ooze EVs: 252 HP / 156 Def / 100 SpD Serious Nature IVs: 0 Atk - Haze - Scald - Toxic Spikes - Rapid Spin

My main way of dealing with rocks and sticky web. It takes hits, removes stuff with haze, and toxic spikes can do stuff sometimes. Maybe I should replace with zapdos support with defog? Suggestions are more than welcome. Feels weird to have a team without any entry hazards, though. I plugged everything into tank stats because I didn't see this outrunning anything important as is.

Gyarados-Mega @ Gyaradosite Ability: Intimidate EVs: 252 Atk / 4 SpD / 252 Spe Jolly Nature - Dragon Dance - Crunch - Waterfall - Earthquake

Another sweeper option after using aurora veil.

Salamence @ Flyinium Z Ability: Moxie EVs: 252 Atk / 4 SpD / 252 Spe Jolly Nature - Dragon Dance - Fly - Earthquake - Fire Fang

Last sweeper. Fire fang provides better coverage than dragon claw IMO, so I chose to run that instead. Eq is eq. Flynium z boosted fly kills things that'd normally wall me.