Swedish tank tree

Hello everyone,
right now im grinding Sweedish tank tree, I`m on br 5.3 and almost always i have problemas con tigers or Leopards, ITs a good tree to upgrade? or its better French or Italian?

i have many toptier Air jets, like F-14 Tomcat, F-15, Rafale, Su-30, su-33,su-34 BUT i trying to grind ground but i cant because of hate and nervious that i not could control, i cant explain it but for me its very dificult on ground, any tips ?

Thanks.