Help? Problem With Holding The Groove On A Hot Pressing

When you change the "weight" of the needle in the groove you are not changing the mass so the resonance frequency stays the same. It is very common to confuse weight with mass. Your tonearm has the same mass in outer space but it has no weight! 
When adjusting the mass of your tonearm system you are trying to get the resonance above record warp frequency (about 3 Hz) and below the lowest frequency recorded on the record around 18 Hz. 10-11 Hz puts you right in the middle. My records have been stored upright under pressure for decades so I very few warped discs plus my SOTA Cosmos sucks them right down so I try to keep the resonance frequency even lower 7-8 Hz. I think this improves the Bass but frankly I have not been able to AB this so it might be psychological:) What I can state as a fact is that if you let it run to high over 18 Hz you will destroy your bass, possibly feedback and send your tonearm skyward. I once knew someone who installed a Koetsu in a Transcriptors Vestigial tonearm and he wanted to know why his tonearm would not stay on the record! 

They never match perfectly which is OK. I shoot for averages between 10 and 8. You lower the resonance frequency by adding weight to the head shell and raise it by subtracting weight. You can get head shell weights that fit under the cartridge or you can add nuts to the screws etc. Subtracting weight is a bit more difficult. Get out the drill. Warning, if you get down to 3 Hz record warps will send the tone arm skywards! Use the anti skate test track to set the anti skate. If you lift the anti skate weight while playing that track you will notice all the distortion go to one side. If you add too much weight the distortion will go to the other side. You adjust it until the distortion is the same and minimal in both channels.

Voiceofvinyl you have a set up problem. Your anti skate would have to be way off to cause that alone. You need to check your arm cartridge resonance frequency. If it is too high when the right bass note comes along enough energy will be created to pop the stylus right out of the groove. There is only one way to correctly set anti skating and to adjust the resonance frequency of your arm cartridge system. You get a HIFI News test record and follow the directions. You want to set a resonance frequency between 8 and 10 Hz both vertically and horizontally if you can. Once you get the hang of this it is easy and you will not believe how much better your table will sound and track. If you run into trouble just message me. Oh, and one of the silliest concepts I have ever heard is running an off set tonearm without anti skating.