Make the bases 18 miles apart instead of 25.
Make the entire map smaller to about 12x12 or 10x10
Don't include furball island or a TT because it defeats the purpose of "winning the map" type of game play.
Create paths of bases that sort of direct action from base to base
Don't create mountains that are too high. Mountains that block short distance fights only create alt monkies and 24K 190s and P51s.
Add big rivers for CV units to flow through.
These are "suggestions" to make the game play actionable and entertaining.
When I am retired in 40 years, I'll have time to make a map. I can only be suggestive. But the main issues with maps today is they don't funnel action, and back bases are too far away to defend against the hoard.
1. - After building 2000miles of mountain range, no I'm not starting a second smaller map. I will control the numbers of bases instead.
2. - I can control how many bases and follow the HTC placement rule for airfields of .75-1.0 sector distance between fields.
3. - I can control GV spawns and bases to where GVs can go. A rough idea is the prototype reference picture below. I can place GV bases and ports much closer to other bases. And it's not a very good idea to tell someone "Not" to create something that takes 3-6 hours to build. Unless you want to cut me a paycheck.
4. - I will use the existence of CV's as air bases for furballs over the tank town island which won't have air fields. I may give each country 2 CV's but, no AAA bases with 63 88mm. Placing those near the HQ and city will be enough pain for bombers.
5. - This is a super volcano, the tallest mountains are the rim, all 2000 miles of 17,000-23,000ft. Everything else is water cut or remnant walls from later mini eruptions. Note to self, map the water cuts to ports. What is the Serengeti plain and the escarpment surrounding it??
6. - The land at the base of the mountain range is 6,000ft, all 2000miles of it, and it all slopes to the center pond at SL. I cannot see making any remanent secondary and tertiary minor eruption rim features higher then 3500-5000 feet weathered down. Much like the primary ring of the center crater in the screen shot posted above.
7. - Note to self, hmmm, Serengeti, giant herds of sheep in place of Wildebeest?? No this is the Euro tileset so sheep are good..........

8. - Honestly I will loose my freekin mind populating bases into anymore area than defined by the two red rings in the clip board map below. Kinda looks like a 10x10 map filled with bases at that point......

The outer area below the mountain range will hold strats, three un-capturable bases (1 Me163 base), and AAA bases. There are some nice 30,000ft bomber sneeking areas at each map corner. Or NOE runs. But, I can spread out two of the un-capturable bases to use as early warning radar stations.
9. - Note to self, push the north shore 12 miles north to even the pond.......