I just hit 250X4@240ish strict, and my strict press has always been very high relative to my bench though I do agree it's always been my preferred bench assistance I never train it from anywhere except the clavicles, why train less ROM unless it's dangerous you're competing or you have to because of injury? I have always found that heavy strict pressing is more of a full body lift than it seems to be and there are nuances to the technique that you just don't get comfortable with or adjust for optimally until you've been hitting it heavy and low rep for a long time.
Taking a video is going to be very helpful here everything from your grip width to elbow position to upper chest beefiness can contribute to your being weak off the clavicles.
Basic suggestions, do push presses, heavy and low rep, to get your body comfortable pressing heavy shit overhead. Savickas presses are awesome as well. I would completely stop training from both heights, pick one and stick to it and get more experience doing heavy singles on overheads, I've always found it transfers amazingly to my ability to "grind out" a bench.