About the game modes , I have a good Idea
but first we need to understand that any mod have a 3 type of players , players who love the mode , and those who just accept the mode , and players who hate the mode

so how about (rotating an increase in battle rewards) on the game modes ?
it would be like :-
1- make the players chose any mode they want to play (no more random mode)
2- declare an increase in rewards on one of the modes so the players so the players who love the mode be satisfied and those who accept the mode find it more interesting to play , and then the players who hate the mode still can chose the mode thy find it fun to play .
3- move the increase in reward to another mode

like this you will satisfy all kind of players , and reward those who can play any mode , and also those who want's to play only one mode can have won't be sad because they are forced to play modes they hate .

for example , I love BR , I accept Domination and KotH , and I really hate TDM ... when I see an increase in rewards on BR I'll be happy , when I see it on Domination or KotH I'll play them to have more rewards , and when I see more rewards TDM I can continue playing BR

Finally a nerf for the shocktrain !
what you said is good but I don't think it's enough

the real problem with the shocktrain is the auto-aiming , the low reload time and the ZERO unload time , this nerf you are talking about will increase the reload time which is good but also consider removing the auto-aiming to give the players chance against this weapon in short range combat by making the shocktrain miss
or
make the unload time 1.5 second and make the shocktrain fire it's charges one by one fo give the players time to dodge and react