More aero as in a lower body position or do you want the aero bars themselves to be more aero? If it’s the latter, look at a new base bar like the Visiontech. If it’s the former, then you need to decide what the stack height on your bars needs to be and then research from there.
I moved from C2’s to the Vision Tech clips because I wanted a little longer reach, but the VT’s, even with the 25mm spacers, are still lower than my C2’s were - not ideal when you have long legs and “normal” arms. 20/20 hindsight tells me I should have gotten the C2’s in a larger size and called it good.
I replaced my Syntace Streamliners with VT base and clip-ons. Love 'em. I have one clip-on in carbon and the training bike is the alum VT clip-on. They are lower then the Syntace so I use the riser for the elbow pads.
I just got the A900 TT Bars and my answer is YES the A900 is worth the extra money. Simply because they are the most adjustable bar on the market and I garentee that you will find your sweet spot with these bars. The only other bar I would get is the HED TT bar. But I promise that the A900 will not disapoint.