I need to give an alternate view on the fuel tank size thing. I am running my Asp on a standard 32t fuel tank, and that is mainly because I focus on minimizing my jump-time rather than the scooping. Let me explain:
The basic idea is to arrive and hit FSD the moment it cools down. That is the main key to jumping fast; always being able to power up the FSD the moment it cools down from the previous jump. As soon as you let the FSD cool down without initiating a new jump, you are loosing time.
The second thing that can influence your jumping speed is how close you are to the star while charging. Too close, and the charge time increases, so I always begin by aiming away at full throttle to get some distance to the star and minimize charge time. If I couldn't directly align while turning away from the star, I wait to align with the jump target until after I got the FSD charging. At his point, I am going so fast that even if the jump target was hidden, I can easily steer around to it while letting the FSD charge up.
Once I am aligned and the FSD is charging, I can check system/galaxy map. I make sure to turn off "vertical sync" and "frame rate limit" in the graphics settings, since the time to open system map depends on your frame rate. I go to 74% throttle or less and open the map. That way I won't jump while the map is open, in case I find something I want to look at closely. Usually though, I can quickly see that it is uninteresting, exit the system map and go back to 100% throttle before the charge is complete, meaning that I still haven't lost any time.
Finally I do have to fuel scoop. With this method, each jump is as fast as it can ever be; there is no time between FSD cycles at all, and the time for each FSD cycle is minimized. However, I need to scoop as a separate activity. I an A6 scoop in my Asp, the largest that can fit. I scoop at 850 units/s (max is 876 for me) and I usually do a detailed scan at the same time. Once scanned, I level off with my nose very slightly up (the scooping rate diminishes quickly when pointing away), just to be safe, then sit there and fill up (by now it's usually just 5-10 seconds before I am filled up).
The reason I prefer this method is that I tend to bungle it a lot less. Swoop and Scoop means that you never have to stop to scoop if you get it right, but I always seem to miss the perfect jump moment. Either I dive too deep and I can't engage FSD once it cools down, or I go too shallow and I don't get the fuel I need. Worst case, I hit the exclusion zone and drop out of frameshift.
Here comes the reason why I like the large fuel tank: I don't need to scoop more than 4 or 5 times in a full kylie, so in the end it doesn't cost a lot of time. The large tank also costs maybe one or two jumps extra per kylie, but that is just two minutes worth. When I make mistakes during swoop and scoop it not only costs me time, it also takes me out of rhythm (I like "Zen-jumping" - there is no me, no jump, only the ship and space flowing by), and possibly gives me damage or costs heat sinks.