I think it´s like it should be.I have a Toneport DI and the input looks the same when using a guitar with singlecoils.
It all depends how strong your guitar signal is.When using vintage singlecoils or humbuckers the output of your guitar isn´t as strong as with modern pickups.The pickup height also influences your output.I use a strat with Fender 57/62 pickups in neck & mid position and I´ve set the pickup height very low so input level was even lower than yours.
I also put a compressor or a TS (gain at 0) in front of a clean amp to boost the inut.
I´m also curious what others do.