From your log, i can see 4 distinctive airspeed chaneges, that gives us a nice flat region to take as samples:
a. 12m/s @ 3,27A
b. 13.5m/s @ 4,07A
c. 14.8m/s @ 4.85A
d. 17m/s @ 5,07A
A 2.2Ah battery will provide you safelly with 1.65Ah (75%) or 1650mAh
So for maximum endurance obviously you will choose the 12m/s speed, whereas
1,65Ah/3,27Ah = 0,504h = 31.2min = 1816sec => @12m/s = 21,8km roundtrip. Which also seams to be the best option for maximum distance.
Summarizing the calcs:
a. 12m/s @ 3,27A 30min, 21.8km
b. 13.5m/s @ 4,07A 24min, 19.7km
c. 14.8m/s @ 4.85A 20min, 18km
d. 17m/s @ 5,07A 19min, 19.9km
- As you may noticed the wind was in your favor for d. and against you in c. The above mentioned values are indicative for airspeed, thus in ground cover can be affected by wind as much as Airspeed-Groundspeed delta (up to 6km in your log!).
2.Furthermore it seems the recruit is a little bit draggy, because it is affected more by headwind
3.your airspeed has a slight offset which needs calibration
4.you may change the prop to more pitch in order to cruise faster with lower rpm (it will be pain to takeoff) I use 4S 3Ah LiIon and T-motor 3blade props for my fwing setup, which gives me 55min @16m/s
5.you may change the battery to a low c lipo or lion with more capacity, Ive seen recruits fly with 3s2p 6000Ah 18650!