Damn. How stupid i feel!!!
All along, cause I've been messing around with uc_cart.module, I did not notice from http://www.ubercart.org/issue/5332/add_cart_form_with_new_productnodetyp... by Riki_tiki_tavi that the issue was:
So my solution was making custom hook_forms() for my module with this code not changing main uc sources (only one line of uc_product_forms() code was changed).
The change is in uc_product.module and not uc_cart.module
That patch and everything is fine and dandy!
Like he says, one line and New Zeal's module is riding smooth!!
God! Two days!! And all cause of being blind!!!!
With all due respect New Zeal, please add in the README that the patch is in uc_product.module for idiots like me!