Impedances for re amping

I recorded guitar DI's at a proper level (average -18dBfs) went out of my Profire 2626 and into my modded Pro RMP, back into the same DI input used to record the DI, with the same level of preamp gain, and I had no trouble getting the reamped signal to the same level as the original DI. In fact I could get about 1dB or so louder than the original DI with the RMP's input gain all the way up.

Yup that is exactly how it should work. The ratio in was inverse to the ration out, giving you the same level post reamp.