With only ECCM-1, despite my previous remark on it, you
might want to take the ECCM back off.
Maybe not. It's not all that big relative to even your comparatively small AMM.
The effect of ECM/ECCM on your attack, per
the source, is that your chance to hit takes a multiplier of (100% - 20% * ECM disadvantage). That means the possible benefits of ECCM-1 depend on the target's missile jammer ECM level:
0: no benefit.
1: 25% increase in hit chance (80% -> 100%)
2: 33% increase in hit chance (60% -> 80%)
3: 50% increase in hit chance (40% -> 60%)
4: 100% increase in hit chance (20% -> 40%)
5: Makes hitting possible (0% -> 20%)
6+: No benefit (0% -> 0%)
So if your enemies are using ECM at all the gain is substantial, but not huge unless they're using a
lot of ECM. Which may be unlikely if they're at a tech level these missiles will be able to match.
Note that this
rapidly changes as your ECCM level goes up, since ECCM 2 improves your hit chance by two steps rather than one against targets with 2-6 missile jammer ECM.
Also note that ECM for missiles is completely different, making ECCM for AMMs an whole other calculation that's less likely to be appealing.