Scooter no performance ? or wishful thinking 😀

A few days ago I brought a TGB Bull&t 25 Black Edition (bm1-a1 25 black edition bj. 2016, 2,8KW) to the bridge, because my car has damage to the engine and I have to come to work (of course used with 10,000 KM).I drive about 15 km per way to work, on the way back about 7 km uphill. The scooter runs on the straight currently up to 45 km/h (Tacho) downhill it slowly continues to 60 approx. (yes, I know ^^) Aaaaber uphill goes nothing at all more, the power goes down evenly with the tachometer and that even with the smallest climbs, the steeper, the more violent it stays on and fights itself through, even if only with 10-15Km/h at approx.30 % incline, at approx.15% incline it remains just at 20-25Km/h. Do I make myself now unnecessarily a head and it is perfectly normal? or could it have something to do with something… I mean it only pulls off 5000-6000 revolutions when starting up until it then on the straight its 45 Km/h has been achieved and thus remains stable at 7000 revolutions. Battery has been renewed at the beginning of the year according to the previous owner and the spark plug I have directly renewed at the purchase day, because it starts badly, which has also been fixed directly. The compression is at approx. 8.2 bar, the exhaust is no longer the most beautiful but it doesn’t blow around conspicuously now. As for the rest I am Laie3… Besides, I also find no parts directly for this model, it can be that it is equal to the construction w he the TGB Bull&t 50 2T AC is, because to that I will be pushed every time in the search. Maybe someone knows what and has some tips for me love greetings go out to the community