Long answer to a simple question

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I do not have a lot of experience with varying types of frames, so I cannot speak to this being foam-filled and its relation to volleying. That being said, both of my forehand and backhand volleys have improved during the last three months considerably. Most of this is due to improvements in technique I think, but coincidentally the timeframe corresponds to when I started using Angell frames. The most improvement however came in with my swinging volleys; I had never been able to hit one before effectively, now it is one of my favorite shots, I just swing and voila!
At the same time I switched to Angell frames, I also switched to using full nat. gut, I think this is related. Touch volleys have been a bit difficult for me, although there is improvement there as well, I am very sensitive to string tension. If my racquets are strung below 50#, my touch volley are not good, the best for me is around 57-59#. I am not sure how much of that is racquet related. The racquet makes it very easy for me to sense and feel what works and what doesn't, I can immediately tell, for example, if I am tensing my arm or hitting in a relaxed mode, and the results are there to view.
Half-volleys have been relatively easy for me, but since I got the Angell's I am finding that I can hit them with greater pace and with more topspin. I think this attributable to the level of control the racquet offers me. If I am at the baseline, I can really swing it and be accurate with positioning and depth, if I am close to the net, all I have to do is a light touch block and control the depth only with racquet head angle.
As I mentioned somewhere previously, the frames I have take the racquet out of the equation for my bad shots and play. They feel as a natural extension to me, they never feel as the culprit to me making mistakes. So, in essence what remains fixing is my footwork, techniques and shot selection, no more racquet to blame. In contrast, when I was using the RF97A, although it was a great frame (none of my frames matched one another though), my OHBHs suffered quite a bit, I was late to most shots, and similarly my FH/BH volleys were always a little out rhythm. I knew I just did not have the right racquet, but out of everything I demo'd, the RF97A was the best overall. It was frustrating to deal with at times. I never feel I am late to any shot due to the racquet now, I really cannot blame the current frames for anything. Starting from 3.0 level to now knocking on the door of 4.0 level (need 4-6 more months), the Angell frames will support me through my progression and I won't need anything different I think. And, if I do, I'll have new Angells made for my new needs