Yes, the assault is not taken in account in your "attack" (which is a base which will be multiplied by everything else). However, it's additive with itself. When you have already 120% assault, another 3% is not multiplying everything by 1,03 (like you did in your calculation), but a change from 2,2 to 2,23 (or a comparative increase of 1.3%).


If you want, between 143% assault and 35 000 base attack, and 140% assault and 35 450 base attack, the latter is better (85 050 in the first case, 85 080 in the second case).