I've dropped five towers for +1 shield, +1 explosion, +3 SoD and started tracking results. Finally got around to counting them, had an even 99.
88 wins (54 were EM, 34 not)
11 losses
That is, an 89% win rate and 61% EM rate (55% EM overall) against Lv5. I'd have more data if I wasn't just playing this during the lulls in WoW.
Losses were from sheer luck (no buckler/SoG after 10-15 turns) or Destroy spam (ie pulv, one time a butterfly effect angel after I'd lanced five previous angels)
lite-grav win EM
airr-watr win EM
life-time win EM
watr-grav win EM
watr-lite win
deth-aeth win
entr-airr win EM
fire-life win
grav-watr win EM
erth-time win EM
erth-erth win EM
watr-airr win
dark-deth win EM
airr-watr win EM
entr-deth win EM
airr-lite win EM
lite-time win
lite-entr lss
erth-lite win
entr-grav win EM
fire-deth win EM
time-deth win
time-lite win
life-deth win EM
deth-dark win
entr-fire win
dark-time win EM
aeth-airr lss
watr-entr win EM
fire-deth lss
aeth-watr win EM
erth-deth win
watr-watr win EM
aeth-erth win
time-lite win
life-watr win
grav-watr win EM
grav-deth win
grav-entr win EM
airr-lite win EM
lite-fire win EM
time-lite win
fire-erth win
fire-entr win EM
time-lite win
aeth-dark win
lite-watr win EM
dark-entr win EM
time-entr win EM
lite-airr win EM
fire-watr win
aeth-grav lss
erth-aeth win
life-entr win
grav-watr win EM
entr-dark win EM
entr-deth win
watr-airr win EM
aeth-entr win
erth-watr win EM
fire-lite win EM
erth-aeth win EM
entr-lite win EM
erth-life win
grav-fire win EM
aeth-lite lss
fire-erth lss
aeth-time win
dark-watr lss
watr-time win EM
grav-aeth win EM
time-time lss
entr-fire win
entr-grav win EM
deth-time win
watr-watr win
grav-watr win EM
time-grav win EM
fire-time win
deth-aeth win EM
watr-entr win
aeth-dark win EM
entr-time lss
fire-fire lss
life-dark win EM
fire-aeth win
watr-fire win EM
fire-erth win EM
watr-life win EM
entr-grav win EM
fire-grav win EM
life-aeth win EM
aeth-watr win EM
airr-grav win EM
watr-life win EM
deth-entr win
fire-entr win
grav-entr win
fire-grav win EM
Right now my thinking is to track this to 200 or so, then do it again with a second explosion. And I should probably use a proper spreadsheet, not a txt dump...