The indoor timp is wrong reading low by5 to6 degrees

You cannot set it that low. It depends on your outside temp? Have you cleaned the filters and condenser coil? The lowest I recommend setting it at is 20. Any lower and you could freeze up the indoor coil. Once it thaws out you will have more water than the pump/drain can handle.

Nothing is wrong with unit ,that's how heat pump work ,you should also have a 2 stage heat which most likely electric heat so when heat pump cannot keep up with temperature the electric heat should kick in and heat up the space

The outside ambient temp has little effect on the suction pressure. The indoor temp is what will slightly effect the suction pressure. In the trade we say we want a 40 degree evap coil, this means approximately 125psi. This is when the indoor temp is around 74 to 78 degrees. The hotter the house, the higher the pressure. I like to see a 50 degree evaporator when the indoor temp is above 80. Charging by subcooling is the way to go!!

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Is the outdoor fan running? The fan cools the coils and compressor, therefore keeping the high pressure low enough to run. Either the fan is not working or its not spinning fast enough. Check the capacitor, or just replace it.

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What is the high side pressure?
Are the indoor and outdoor coils clean?
Indoor and outdoor fan motors working OK?
Ice on the coils or expansion valve?
Is the unit sized correctly for the space?

The correct way is to evacuate the system,pull a vacuum then charge with a refrigerant scale.
In lieu of that you can charge by pressure and get close.
Normal operating pressure would be 68 psi on the suction side and about 225/275 on the high side.
You do have to calculate the outdoor and indoor ambient temperature.
At your 75 degree outdoor air a low side pressure of 60 psi or higher would be acceptable.
Your 30/130 is too low.
Add more refrigerant.

Make certain the indoor coil is clean and the fan motor is working correctly.
Have the leak repaired.

The temperature outside and pressure chart are needed to accurately determine the proper charge. (temperature pressure charts to calculate heat gain) However the low side of the unit should read around 70 and the high around 210. This is a really broad generalization and I do not recommend you charge your unit just on this info. It will get you close if you are using R-22 and the unit is properly cleaned. A dirty evaporator coil will cause a severe low pressure reading on the low pressure side.

You have a low refrigerant charge. Your low reading which coresponds to the temp at the coil 49psi is about 20 degrees fr. It should be closer to 70 psi depending on the ambient temp indoors. The coil has to be above freezing I usually shoot for 38 to 40. your sub cooling needs to be at least ten. And if you cant feel the heat leaving throuhg the condenser fan it aint moving it.

The pressure changes with temperature, it is not a true gauge to ensure a proper charge.

You should have a 15 to 20 degree temp drop across the evap coil. (return air vs supply air)

Can you verify that the compressor is running?
Not the condenser, but the compressor located inside the condenser (outdoor unit)

it really sounds like it is still undercharged.
Check the temp drop, let me know what it is.
Also tell me what the outdoor ambient temp is.

( for example.... 98 degree outdoors with 85 degree indoor temp could result in pressures something like 325 on the high side and 75 or 80 on the low side.
With the exact same unit, but 80 degree outdoor temp combined with 70 degree indoor temp, your pressures could read 215 low side and 55 low side. Not to mention that more efficient units often have higher pressures on the low side because they have more coil space and remove heat more efficiently)