I suggest raising the
num_bits=128 to 132
def make_seed(self, seed_type='standard', num_bits=132, custom_entropy=1):
https://github.com/spesmilo/electrum/blob/master/lib/mnemonic.py
So the bwp and num_bits line further increases it to 136,
bpw = math.log(len(self.wordlist), 2)
num_bits = int(math.ceil(num_bits/bpw)) * bpw
And by losing 8 bits entropy, we will have 128 bits as
de facto entropy if that is the goal. Because currently the defaultly generated seed has only 124 bits of entropy instead of 128.