Thermal adhesive tape vs Thermal adhesive pads?

Hi everyone!
Im trying to improve the cooling of my laptop GPU where the heatsink is very basic for some reason. The GPU is MXM 3.0 B HD5850 as much as i recall its around 35-37W yet still produces a lot of heat because the laptop is a 15 inch with cramped case model MSI GX640.

Now the issue is that no matter how much you try to repaste or clean the fan or whatever it still overheats on its own under heavy load. Have a look at the photo below and if you see the heatsink over the MXM is just a thin copper platter which barely does anything in comparison to modern MXM heatsinks which all have fins and thicker layer of metal/copper.

Thats where i decided i will try and attach multiple extra heatsinks in hope it will have some effect to drop down the temps. However i am not sure of the best way to do it and looking forward to you folks for advice if you have experience modifying cooling with extra bits and how do you attach it for the best thermal transfer?

I found thermal self adhesive pads and also double sided thermal adhesive tape like this https://www.ebay.co.uk/itm/Ritte-Th...ve-and-Insulating-Double-Sided-T/224034572632 or this https://www.ebay.co.uk/itm/Adhesive...-conduct-for-led-pcb-heatsink-FJ/143605076800 however not sure if this is any good and if i should stick with transfer pads instead. Any advice on best possible solution is highly appreciated, im planning to do a proper job even if it means spending a bit more. Thanks!