I have experimented with drum sequencing, with the internal drum wavetables, and some custom wavetables I created.
The first thing to consider is that each of the drum wavetables contains 4-16 different samples, and each of the samples starts at a different point in the wavetable. Here's the approach you will most likely want to take:
1. Set up an aux envelope to Osc3 Shape Mod, like you mentioned you have. For the amount, you'll need to experiment, but start with some relatively low amounts, like -15 amount. For the ADSR amounts, start with something like 0,20,0,20 for the Aux Envelope.
2. For the Filter Cutoff envelope, try starting with ADSR values of approx 0,40,50,40. And for Amp envelope try starting with 0,40,0,40. You'll need to experiment with the filter cutoff and sustain to suit the sound.
3. Set up some steps in the sequencer to play a C... like every fourth step to start. Start the sequencer. Set a seq lane to go to Osc3 Shape Mod. For each step, you now need to experiment with the Osc3 Shape Mod Offset... this involves some trial/error/listening to find where each different sample starts. (just use the soft knobs to navigate to each appropriate step and set a value) For instance, you might want to try and find the kick drum, snare drum, and hihat sounds first. As you adjust the offset in the sequencer step, you'll hear different sounds... and depending on what you set for amount in Aux envelope, that will determine how far from the offset point the sound sample plays (and at what speed)
4. You will probably also want to route some of the sequence lanes to the Decay/Release of the envelopes, to fine tune the wavetable scan speed, and/or the cutoff/amp... and it will differ depending on whether its a kick sound, snare, hats, toms, etc... you can fine tune each step in the seq.
I uploaded a custom sampled 707 wavetable here:
https://www.presetpatch.com/f/Sequential-Pro-3/35_707Kit16_syxHere's a demo I put together using drum wavetable sequencing and the four phrase lanes to play a drum sequence with variations in real time: