I'm seeing that you've never played SWC on Windows, DS... If you'd played like me and many here for years, you'd have that same experience multiplied. While I was Rebel and I left Tatooine for Hoth, my first planet unlocked, my base level 5 was combined with hell beasts level 9 and 10 maxed out (I'm not talking about minis but full bases), and had to attack anyway for the great loot and to try to add 1 more out of 20 stars (yes, 20) to get out of that hell and back to Tatooine, where matchmaking was less stupid, but even there, levels 5 or 6 did not escape being attacked by level 9 or 10 beasts.
The thing was less bad on Android, when I started my Rebel base almost 2 years ago, but since some time ago, the criterion used by the Devs only worsened the combination of results, and for this Event it is not being different from what was for past events.
Currently, my Rebel base level 9 is being combined with baby bases level 6 and 7 and some sandbags level 9 with defenses level 4-5, while my Rebel base level 8 is being combined with maxed out levels 10 all the time. The only base that is currently being matched with bases of the same level is my mini base level 7, while it is a mini (746 of BS) and 14k medals, the high amount of medals outweighs the low BS and is offering rivals of my level, which is easy get 3 stars because my attack is strong and my armory is well fitted.
Another thing that is interfering in matchmaking is the large amount of minis with extremely low BS and high quantity of medals. I see this every day in wars with my Rebel squad. More and more players are realizing that they can manipulate matchmaking by controlling the strength of their defenses and the amount of medals, regardless of their HQ level and the strength of their attack and equipment in Armory.
I myself have been testing various combinations of base strength and medals for the last months to try to understand the matchmaking and try to control my enemy levels, but honestly I believe that the Devs have thrown out all the algorithms used for matchmakings and after the introduction of this Event system, everyone is being combined with players 3-4 levels above and 3-4 levels below, and save yourself if you can....
A Windows survivor now training players and helping squads through the Galaxy!
Imperial HQ10 in "BombSquad18" (Level 49 squad)
Rebel HQ10 / HQ8 in "Ewok_revenge" (Level 50 squad)