Hmm seems a somewhat common occurrence these days MAC but I would suggest a slight modification to your tactics.

It might sound daft but the best way to counter a tank is overwhelming force IMHO.

So get whoever in your squad who has drop uplinks to try and get one in an elevated or covered position that has at least 2 exits and then get whoever has FG fittings to suicide and spawn in with them but be sure to keep you best assault players in their gear to keep infantry off the Heavy AV. Just hammer the tank, Assault forges and double complex damage mods is the fit I use as Swarms even proto are really only effective against LAVs and Dropships they just don't have the damage or fire rate anymore. You will likely lose a lot of ISK but if you're stuck in an objective it's the best way to deal with them just get stuck in, the Suicide LAV tactic only works if you have time to call in and prep it and the same goes for Proxy mines as they need to be dropped as entering an objective.

Your Commando fighter does have his head screwed on by taking Proto swarms but remember it's only for suppression and he'll need Nano hives to keep up his ammo so that stops him from taking RE/Proxy mines. Since he is already used to being flexible and skilled in the heavy suit he may a good candidate for being a Forge gunner but remember to keep Uplinks nearby as FG users are very exposed to small arms fire due to low speed, big hitbox, big scan profile and no primary infantry weapon.

Also don't listen to Takahiro, he's one of the biggest tanker Trolls I know of and I have it on good authority that he used to play as EnglishSnake the Butthurt vet who quit after the New Eden Missile tank crisis (Oh noes I can't go 50-0 anymore wahh wahh CCP broke my toy!)and only came back now that Tanks are flexing a bit too much muscle again.

Chin up MAC the Tank nerf is coming in 1.8!!!