Shipping Pro - discard the base cost of one of the shipping classes if both of them come up in the cart based on states

functions.php

add_filter( 'wf_woocommerce_shipping_pro_shipping_costs',  'wf_hide_base_cost_for_non_westcost');

function wf_hide_base_cost_for_non_westcost( $costs ) {
	$shipping_state = WC()->customer->shipping_state;
	$states_requires_price_adjustment = array('CA');
	$shippingclass_requires_price_adjustment = array('shipping-class-a');
	
	if(!empty($shipping_state) && in_array($shipping_state,$states_requires_price_adjustment)){		
		foreach ($costs as $method_group => $method_cost) {
			if(isset($method_cost['shipping_name']) && isset($method_cost['cost'])){
				if(count($method_cost['cost']) > 1){
					foreach($method_cost['cost'] as $shipping_group => $shipping_cost){
						if(in_array($shipping_group,$shippingclass_requires_price_adjustment)){
							$costs[$method_group]['cost'][$shipping_group] -= 13;
						}
					}
				}	
			}												
		}
	}
	return $costs;
}