I did a couple of speed runs last night, one heading away from Sag A* towards my first targetted Nebula, then another for 1000LY away from that Nebula in the direction of the next one.
I made the runs in the same way as my Buckyball Run to Sag A* in 1.2 - Keep throttle at 100%, hit jump as soon as the cooldown clock has finished, check the next star by glancing at the Galmap (just in case it's a Neutron). The only change from my racing method was that I glance at the system map while the FSD is charging and cancel the jump if I spot any waterworlds/earthlikes.
Everything seemed to be as it was in 1.2, there's a chance that the temp rises faster when scooping while the FSD is charging, but the ones that caught me out were Type Fs and they sometimes toasted my ship a little on the way to Sag A* as well.
Note that my ship's an Asp with an A6 scoop and a cool running class A2 reactor, so I've not had a temp of greater than 110% since leaving Sol.
Since no one else seems to be experiencing the same problems as you (and I'm clearly using a much riskier flight style than you), I'm wondering it you have orbital rings showing or hidden? I have them showing because the gravity well always catches me out if I switch them off - especially with type M stars, their minimum distance is huge in comparison to larger stars.
If you have orbital rings switched off, then perhaps FD have tweaked the sizes of the minimum orbit, as it sounds like you are being pulled out of FSD by approaching too close rather than by over-temperature.
