Buderus Gb072-14 Boiler with RC300 & MM100 Modules: Insufficient Heating in 100m2 House

Hello,
I have a gb072 14kw boiler + rc300, all connected with 2 mm100 modules, to the Afriso pump group with 2 Grundfos 25-40 180 pumps with 2 automatic reculators.
I have a problem with heating the rooms. The installation is made from the plan. Dom 100m2, 8 radiators, +1 floor circuit for 3 rooms. 10m2 each. Closer radiators, of course, choked, without thermostats.
When the weather is set to 55 * at -20, only 40-45 * goes to the radiators and despite the fact that I have 20 cm of graphite on the walls and ceiling, I feel cold at home.
With settings according to room temperature, this problem also occurs. The only possibility to increase the supply temperature is to set 82 *, which is the maximum on the boiler, and to set the pump control to delta P4 (whichever is the highest). To get the benefits of condensation and set, for example, 55 * on the boiler, the radiators go up to 37 *. I have photos from the entire service menu, I can send them to e-mail because there are 40 of them
I am asking for advice.

Heating curve set too low. At 55 degrees to -20, you'll never warm your home properly. Apparently, at such temperatures as at present, the curve will result in about 35-40 degrees, so it's also not much for heating with radiators. The RC300 allows you to graphically adjust the heating curve, much better than in the boiler settings. I suggest you set at -20 temperature 70 degrees and see what is set in the option of room influence on temperature regulation. If the house is new and well insulated, you can leave the factory 3 if it is an old house, but after renovation, raise it to 6. You can also see what the maximum power for CO is, because service technicians often reduce it.

Thanks for the answer. I do not know if we understood each other well, but my problem is that the boiler does not set the temperature on the radiators.
For example, the boiler preset temperature 55 * - actual 55 *, Supply temperature - set value 55 * - actual value 41 *.
I am talking about this discrepancy. If I had 55 * at -20, there would be a sauna at home. I have the influence of the room at 9 and the pump on DeltaP4 otherwise it will be max 40 *
Or maybe, as you say, this buffer, i.e. the boiler temperature, must be much larger, i.e. e.g. 70 *, but what about condensation then?

The boiler condenses to a return temperature of about 55 degrees, so you can set the power supply to +/- 65. I would have to play with rc300 to come to some sensible conclusions because if the building is new and insulated and someone has set the room's influence to 9, it is not known what else interesting came up with

Tomek, I think that if you set such a high temperature on the boiler, the radiators will be warm with even 0 influence and the boiler pump on the car. I thought if I put 55 on the boiler, it would be 55 on the heaters. Well, apparently the buffer is too small then. My suggestion was that since it heats the water in the tank about 100l instantly, it is able to keep the 55 on the power supply.

Perhaps the heating power is reduced and therefore cannot maintain this temperature. The maximum and current heat output can be read in the info menu.

It is full.
I put 65 * on the boiler, design and max too. Boiler pump for 4th gear, central heating pumps for I. When heating from the reduced mode 21.5 * to 23 * the supply temperature that I managed to get is 51 * supply and about 42 * return on all heaters except the last 2 (more than 20m from the manifold ) which are not throttled and the return there is about 46-48 * - but I think they need to be throttled. Outside in the morning around -10.

At the current temperature and in the settings, sr. gas consumption is about 10m3 per day at home 23 *