Interesting thread (seems a rarity these days...)
EN48, what does your TOT settle at? My 250 has a similar start characteristic to yours (it seems like it has a 'hump' to get over at c40% on first start), and seems to settle at around 630-650 degrees at 75% torque in the cruise with no anti-ice or bleed air heat. This is a little higher than I'm used to (206 with no particle separator), I wonder if there's a connection?