Separating Reiatsu from Reiryoku won't work. Itvwoukd be a bad idea to separate the subsequent byproduct of the universal power-base. I can see issues with fundamental flaws and loopholes if we did that.
While Epi suggested a multiplier, an additive is similar in nature but to a lesser degree. The problem remains that Reiryoku-based fighting styles would be favorable. However, I must also state that using the reiryoku amount by an additive percentage makes the system more complicated even if only a little. I see no other reasonable fix for this currently, so I'm prepared to use an additive number over a multiplier. I recommend a set value over a rough percentage however: otherwise members will not enjoy doing math every time they attack. I am considering an additive number based on between 10-50% of their Reiryoku level. I know that sounds contrary to what I just said, but it prevents the whole complicated math about a 25/5 ratio.
We just need to determine an appropriate percentage to increase the additive by. It should be a noticeable difference, but not something overwhelming. Keep in mind that using your Reiryoku to boost any given area in combat leaves you succeptable in other aspects. If you go on the offense with it in one post and someone attacks you in the next post- you wont have the time to channel your Reiryoku into your defense: so there can be no additive. This is a rule we will have to enforce with the system to keep balance and cohesion.
As for the percentage- I recommend 50% personally. That may seem like a lot, but it doesnt have a significant damage boost until you reach the higher tiers. In canon, a captain's reiryoku was enough to cripple a weaker foe: so this makes sense. We can change this percentage value at a later date if it proves too troublesome.
Id like.to wrap this system up soon. So lets keep the end of this dicsussion short and sweet. Currently i am in the process of moving: my sister kicked me out of her household, so Im trying to deal with some personal stuff atm.