well if gaijin bothered to model L15A5 as it should be then we wouldnt have this issue.
Mk5 could get that and the LRF and be a great tank.
Yup bug reports got accepted the other month there!!! :D
The l15A3 APDS is actually one of the few fantastic APDS in the game due to its weight and so on, it does a lot of damage, usually one taps most things In my experience with it.
https://community.gaijin.net/issues/p/warthunder/i/kBDyXv4H7817
mark 10 has 80hp evaporated into the nethersphere lol,
though the Mark 3 and 5 would lose 10 and 40hp respectively,
its worth the slight degrade in performance to make the chunkiest of them all better imo,
10hp is nothing really and 40 would be noticable but not harshly noticed being only like 6% of total HP, while the gain of 80hp would be welcome being an increase of like 11%
Then the mk11 would be fun to get as well