4x100, at BR 3 twin engine bomber while all lower and higher br ussr attacker planes carry more ordinance. It carries load comparable to some br1 fighters.
This plane should have a max load of 1000kg, so please bump it up to at least 8x100 or maybe even 10x100, if 6x100 or 750kg (axis stuka) is fine at BR 2.
It’s good where it is
You are entitled to a wrong opinion. 
Well it’s my favorite BR3 USSR attacker. I think it is fine where it is because it’s extremely maneuverable, and the bombs are easy to drop precisely.
Ju-87 D3 is BRIII
I think 2 * 2 250kg will be good for boston
Cause british version in warthunder use 2 * 2 500 lb.