backline splits , surrender or split for this case ?

according to wongs basic blackjack

there are sacrifice splits which suggest player to split most hands if the backline is larger than original bet 700% which bet by the same player

wongs said this is also suitable for hole card game , which dealer picture uphand still have chance for a bj

then how about early surrender against ten rule for hole card game , according to bs for this game , 7 7 and 8 8 vs is a surrender , so if i bet 700% at backline , should I split or surredner (Double allow after split )

also , I want to know , stanford wong only mention 700% is suitable for all conditional split ,how about below 700%? for example from 100% to 600% , what split stragery should be changed ? anyone can provide more details ??