91 OCC 700R4/4L60 shuddering

A quick question, if I am at cruising speed and speed up slightly on a marginal incline and the car studders like a rumble strip when unlocking the converter, is that torque converter shudder? It doesn't do it if I speed up aggressively and down shift nor does it do it when I accelerate and brake to test the lock up. Only on gradual acceleration and mostly when using cruise control. I did a fluid and filter change with DEXRON III about 3 months ago and this has started in the last couple of weeks. It does not do it going into fourth gear only coming out.
The car did a more violent version 5 years ago when I bought it and had cleared up with fluid changes and some shudder fix. I did not replace the shudder fix when I did this fluid change instead I did the Lube Gard ATF Protectant. Should I still use the Shudder Fix?

had my 94 rmw doing that, but I had a full flush done on it, not just fluid and filter, and the shudder went away, my car only has about 153,000 miles on it though.

This one has 132,000 but the previous owner wasn't as attentive nor did he drive it much. I daily it.

You can get a shudder stop at NAPA. It worked temporarily in my OCC until the 3/4 gave up.