2 questions

[Fabian]

The standard cylinder head does not have a squish band which is just one reason why it's a poor choice when compared to the available aftermarket cylinder heads that are machined with a correctly designed combustion chamber, with a choice of compression ratios.

No amount of grinding, pasting, honing, gritting and mating will fix a poorly designed combustion chamber, and at the end of the day a well designed billet cylinder head is a "one-time" investment. After 6 months you won't even remember spending that $90

 

[Fabian]

I think the source of your overheating problem is that you seem spend a lot of your time in low gears at low speeds with heavy loads.

I have to completely agree with your comment, which is why i need to seek out the best available aftermarket options for my motorized bicycle.
I don't have a choice with respect to using substandard parts/components on my bike, because i need bullet proof reliability and functionality.