I got 3.5 - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 - 15 m2.
@77 kg and a 1200 wing it corresponds to your 1100 cm2 and 72 kg, same thing.
My 5 m2 starts from 14 to 15 knots on the big wing.
From 20 knots I am overpowered, can still ride but not fun. With a smaller wing a bit better but not much higher.
Sweetspot is 16-18 knots for me with the 5.
A 7 m2 starts in 12-13 knots, on the low end though, sweetspot around 14-15 knots, and from 15-16 knots overpowered with the 7.
As I ride waveboards too, I find it important to have small steps, as the 5-6-7 m2 is used the most in waves.
The same thing on hydrofoils IMO, hate to be outside the sweetspot - only in some size waves it is okay to be on the low end.
I would suggest 5-7 for you, but 4-7 can work but it is a big difference and you have to work the 4 like a maniac in the wind between these sizes.
If no waves even bigger difference...
If you get a 4 and 7 and find the step a bit big, you can later get a 5.5 so no risk in this step, and you can ride with the 4 from +20 knots, where a 5 gets too big.
How many struts is unimportant as windy, does not matter at all, and if you like to ride waveboards or TTs also get more struts to cover everything the best
If you ride with straps and like to ride powered and jump, forget all about my post, but based on your numbers it does not seem like this is your goal.