Solved

My car's gone slow. HELP PLEASE

Hello good afternoon.

I've been racing a lot with problems with the car and I wanted to ask what problem it might be due to.
Last season, specifically the last half of the league I managed to overcome a difference of more than 100 points and win.
Before I used these suppliers cosurworthit, chavon, donelots.

What has changed?

An example that summarizes everything is: last season in today's race in Hungary (100%) with a similar tactic I won with H-H-H and got more than 4 seconds to the third and 33 to the fourth.
Today, I was 14 seconds from the second...with drs in many laps, good push...
Well this example multiplied by 6 or 7 races.
In addition now I use suppliers that give you strengths in the big 4, the chief designer changed it at the beginning of this season so I did not make a good car but it is good 
…
So what happens? hard tyres better at 3 stops if there is a good car?

Changing a CD at start of new season means the new CD wont of had much to do with the new car. Also other teams may of improved. Tyres react differently to change of weather for instance H H H may of won last seaaon in 28c temp but S S S may win next time say temp was 14c. Many variations. Your pace may be down to your drivers aswell rather than car performance . so many reasons why pace drops and gains its difficult to explain but just because you are near top 1 season doesnt mean you will be the next.

My New providers are correct? 

I used 2 stops hard frequently at rookie and pro level but it doesn't cut it at Elite level....The fuel load is far too much. Alit of people use SS in Hungary. ...