You're in the right support-thread!
The BS4/OPC makes changes to every one of OPC's template_default/template files (except for tpl_modules_checkout_one_shipping.php), so you'll want to make your subsequent changes to the tpl_modules_opc_shopping_cart.php that's now present in your clone of the bootstrap template's version.
I've got stuff going on this morning, but will try to get back later today to answer the part about adding the unit-price to that template.
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