Yes, make sure to not run low, even if it shows on the dipstick it is still low; when hot, the hot-full mark is the minimum level; you can safely overfill by 1/2 quart.
A few bubbles are ok, foam is not ok, you can see evidence of foam in a very short amount of time.
Try overfilling by a whole quart and see if it makes any difference (and then remove it by sucking it out via the dispstick tube).
Any color other than red is not ok (fluid is showing signs of local burning due to slippage).
Are you saying that TCC is slipping more and more while being commanded locked...?Its getting to the point it wont hold TCC lockup at all at this point. Starts slipping out no more than it locks up.
Or are you saying that TCC is not being commanded locked.