Now that the door has been opened to make bombing strats worth the trouble, it's still not worth the trouble for fighter fans to defend them.
The best example was a big long furball I was in for hours friday night to take A20 from A16. Very few players were willing to stop furballing once they knew bombers were hitting their strats just a sector away from the furball and their 163. They were more interested in flying 163 to A20 to furball.
So with the door opened to the slippery slope leading down to strategic bottelnecks, here is one thing that can be done to get fighter pilots interested in protecting their status quo. Put a 163\262\Tempest\F4u-4\spit14 factory in the strats. As it's destruction percentage goes up, so does the price for 163\262\Tempest\F4u-4\spit14 for that country until non are available. And as the resupply effort takes place the perk price reduces back to normal with each resupply or some such formula. Throw a few bombers into this while we are at it. Even get so nasty as to engage a perk price on P51D, D9, Ta152 and K4 when the perked fighter factory is 100% down.
You could even get the tank guys up in fighters or resupplying the strat if you include their pet rides in the same process. I suppose a modifyer for ENY will have to work with it.
If the HQ and strat are now high value bombing targets, it's logical to give them long range radar to assist in defending them. Create a secondary clipboard map that only shows the long range radar coverage for the HQ and strat. The germans watched the allied bomber hoards group up over england and all the way to their targets on the continent if I'm not mistaken. Restrict this radar to only showing planes above 10-15k but, with a long radius. Bombers that try to stay just below this most of the way to the HQ or strat will leave themselves open to interception.
But, if you sit back and look at this from a 50,000 foot perspective. The bomber guys will be controlling everyones game happiness by forcing them into fighters or on resupply runs in the hope that they can get their favorite perked ride at a resonable price before some jerk with a B29 screws their only saturday in the last month that they have time to play the game.
So maybe as your bomber guys destroy another country's perk plane factory your own price for them goes down untill they are free or something like that. At least you would make the arena an intersting place if 3 bomber squads worked together from the 3 different countires and 100% dropped all 3 perk ride factorys. Hundreds of noobs in 262 all over the arena in littel hoards untill the first resupply train or players got to the strats.