If you see the UOA section, the oil specifically made for the hemi is in viscosity 10's sooner then 4,000 miles, that is PUP 0w40, see for yourself, look up hammers uoa's. So basically what you did was turn your 5w30 into 0w30 by adding two quarts, but not some random 0w30 but redline 0w30 which is very stout. We have guys with cold piston slap prefer redline 0w30 in the 6.4, as a top choice. This gives you great start up viscosity but yet stays stout enough to last the entire interval. If I had to wager a guess, if your truck is running good you will still be in the 10's even at 7k miles. If it is ok to be in the 10's with the hemi oil specifically designed for the 6.4 hemi, then it is ok to run redline in the 10's especially considering the extra metal protection additives and base oil that oil has. If you tow heavy in hot summer, you could drain off a quart and add a qrt 15w40 this summer, but absent that condition I wouldnt chnage it early if it were me.