My recent trip around the outside of the bubble in a T9 with the biggest A rated fuel scoop that fitted showed me that I could keep the heat under 70% with ease. I did have to be aware of the stellar class before arriving since it changes the way that you scoop. Some stars, class M for example, you can get quite close. Others. G class for example, you should not get close to at all. In all case I would pull up when the fuel scooping was almost completed so that the sun was behind me and then wait until the scoop closed before hitting the jump key and aligning the ship to the target.
I should mention that for this trip I had all my modules enabled. Had I turned off the unnecessary ones I would have run a lot cooler.
Oh, and never turn across the sun after arriving in a T9, always turn towards the closest edge.