Tou could try a partial sparge to increase efficiency or limit inefficiency (if that's a word). You could either:
1. Heat sparge water in the BK, put it in a temporary holder, then sparge with it as the wort is pumped over from the MLT to the BK.
2. Heat sparge water in the BK, then pump it onto the top of the MLT while pumping the wort to the bottom of the BK (under the hot sparge water).
3. Heat the sparge water in the BK then gently pour it on top of the MLT water. Once you start the transfer, this low gravity water will rinse grains in the way down and not fully mix with the wort.
Anyway, just some ideas.
1. Heat sparge water in the BK, put it in a temporary holder, then sparge with it as the wort is pumped over from the MLT to the BK.
2. Heat sparge water in the BK, then pump it onto the top of the MLT while pumping the wort to the bottom of the BK (under the hot sparge water).
3. Heat the sparge water in the BK then gently pour it on top of the MLT water. Once you start the transfer, this low gravity water will rinse grains in the way down and not fully mix with the wort.
Anyway, just some ideas.