NIC Priority

I haven't seen any other threads on the topic, nor could I find much in my search. 

I have finally built two high performance unRAID rigs. Finally put the network together. Now, my final piece is to utilize the performance I have theoretically achieved. 

My overarching question is 

1) How to assign priority to my 10gbe or 40gbe NIC. I have 2 NIC's on the motherboard, and two NIC's installed (Mellanox Connectx-4 and Chelsio T580) I have the Chelsio directly attached to two devices. I have both ports of the Mellanox connected to a switch. 

Given the switch is also the method for connecting all networked devices to the gateway, the internal NIC's are also on this switch. Every transfer I try goes ETH0. I cannot figure out how to get the shares/transfers to go through either the 10gbe or 40gbe connection. Would it be better to put the file transfer network on a separate subnet than the subnet which the 1gbe NIC's are on? Or would it be better to bond the two 1gbe and two 10gbe routes? (that leads to the next question) 

2) Of all the aggregation/bonding protocols, which one will provide an increase of both bandwidth and throughput? I've re-read the descriptions of all the protocols, and conceptually understand what each does, but there is very little documentation I could easily find (via google search) to talk about both bandwidth and throughput in relation to the protocols. The protocols usually just mention how bandwidth is increased, if at all. It does not mention if throughput will scale with bandwidth. Thus, if I used balance-rr to bond two 40gbe NIC's, I have 80 gigabits per second bandwidth, does throughput scale in the same manner? I'd ideally be able to achieve 3000-4000 megabytes per second throughput for at least two connected devices (utilizing nvme-of most likely).

3) In addition to the above, for the Chelsio, which provides DAC (connection) to two separate devices; how do I send the transfer through the 40gbe route, as opposed to the 10gbe or 40gbe? I assume the only option here is to assign static addresses on a separate subnet, like 255.255.0.0. 

Thanks!