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Partial answer

After Hint 4, it seems we need to

convert the given letters into symbols for elements on the periodic table. Since this doesn't make sense when reading forwards, we go backwards instead.

The letters are then:

Eu Md Ir Db Pb Es Ge Tb
Ge Lv Au Ds Ge Yb Rg Ge Ir
Bk Pb Lr Tb Ds Tb Ge Ds Tb
Ge Uup Ta Ge Md Pb Uus Po
Bk Tm Fl Ho Ge Hs Tb Es Ta
Lr Tb Mt Ge Hf Es Ta Rf Fr

Next step:

convert them to their numbers in the periodic table:

63 101 77 105 82 99 32 65
32 116 79 110 32 70 111 32 77
97 82 103 65 110 65 32 110 65
32 115 73 32 101 82 117 84
97 69 114 67 32 108 65 99 73
103 65 109 32 72 99 73 104 87

Taking these numbers modulo 26 gives

11 23 25 1 4 21 6 13
6 12 1 6 6 18 7 6 25
19 4 25 13 6 13 6 6 13
6 11 21 6 23 4 13 6
19 17 10 15 6 4 13 21 21
25 13 5 6 20 21 21 26 9

Or as letters,

K W Y A D U F M
F L A F F R G F Y
S D Y M F M F F M
F K U F W D M F
S Q J O F D M U U
Y M E F T U U Z I

Which doesn't seem to make sense even under any possible Caesar shift.