Hikashop Product Characteristics & Pricing

I am seeking some support to help me work within Hikashop for our products.

The Issue is that our products are priced according to a matrix of characteristics for example height, width, diameter etc.

The current implement of Hikashop only allows me to have a relatively small number of characteristics (5 x 5) before it blows the memory on my server. I would like to change the functionality to only load the price for the selected characteristics as they are selected from the drop down. I use characteristic indexes to build the macro price and can show you my system

I have created a look up table which I can load the the pricing I just need some help to code out the current module and do the lookup as each option is selected. Anyone out there willing to help me with this?