Over the summer, I attended a friends BBQ – he is a serious audiophile. His set up cost well over £10K, which includes CD player, record deck, pre-amp, twin valve power amps with bespoke speakers.
The system produces a superb smooth sound, well into the low frequencies.
At one point in the evening, unknown to me, a neighbour brought a selection of vinyl albums and started playing a selection of tracks. It took careful listening to hear the surface noise from the vinyl. I thought that the records had been lovingly cared for, to minimize noise from scratches etc. But no, the neighbour had purchased the records from a charity shop and examination of the record surface revealed the type of damage one might expect to see on a typical record.
Given the above, despite what you say – I would suspect your record deck to be at fault.
My advice would be to take a selection of the records to your local audiophile emporium and ask if you can hear them played on their equipment.
Even though there might not be a sale in it for them – they will normally be more than happy to help you identify a problem with your set-up. You never know, you might end up replacing your record deck.