Cushion Grip Thermoplastic Denture Adhesive – Refits & Tightens Loose Dentures, Works Like a Denture Reliner for Comfort & a Secure Fit, Holds Up to 4 Days, Glue-Free, Waterproof & Zinc-Free - 1 oz

I couldn't get my bottoms to stay in place at first either and they did want to sit to one side and that didn't go away until I was able to get them to stay and even with that it's a trial and error thing.. Once your dentist approves you using adhesives I would try try this because it may not help with suction but it should help with them rubbing and painful spots/

I would say find different adhesives and see what works. Also I am having similar issue where mine didn't want to stay in place all day and rubbing my dentist told me to get this.

I am in a similar situation I got all my bottom and 2 top teeth removed 3 weeks ago and removing the bottom ones was hell. I started out eating mashed potatoes, over cooked pasta, pancakes and things like that. Now I have lost some weight because of it but I was trying to loose weight to begin with so not a bad thing for me. When I told my dentist that mine keep coming loose they suggested this stuff. Also what I have been doing is placing these directly in the dentures then adding polygrip free on top of that so they have a little cushion.