1) I do think that in some instances they are easy to see, while in others they are not. I think that given the cloak nerfs, the fact that they can no longer be used for easy combat, that perhaps they could make the cloak less visible in movement (I think that they are fine where they are if used when stationary).

2) I don't think 3% will do much. I think that instead of a per level bonus to cloak that the entire bonus be unlocked at std level (possibly ADV if somehow this is a major issue). That way it will still provide some benefit for new players that want to use it.

3 and 4 I think are addressed above.

I don't think the point of cloaks should be to run THROUGH large groups so much as run AROUND them.

Unfortunately I don't think the shimmer can be changed (at least not easily or soon) because they used the same VFX for cloaking as they do for the invisiblity upon respawning. Since changing the shimmer is (probably) off the table, there are a few things I would do to buff the cloak.

Option a) Reduce the cloak swap delay by about 1/3

Option b) Slightly reduce cloak fitting costs

Or possibly both. This is assuming that the "sprinting cancels the swap animation" and "swap is still slow even if you're not decloaking" things are unintended and will be fixed. I don't want the cloak to be OP or used with shotgun scrubbing but these seem like reasonable changes. As it stands the cloak just feels really shitty to use and is too easy to counter to warrant the benefits.