First, I would leave all expectations at the door. The funny thing about dmt is that it will never meet your expectations. Either it will blow you away or it will seem like your powder is broken and not much is happening.
Second, I would upgrade your route of administration. Sandwiching 70mg of dmt isn't really a good idea in the first place and since your taking your dose in multiple hits rather than one you should expect less than par results most of the time.
I Have had some pretty profound experiences on pre-breakthrough doses that had plenty of visuals, and some just as amazing experiences with very little visuals. The visuals are not really THE experience. From your description you had a great experience with lots of lessons. I do understand the want you have to SEE the unsee-able but I wouldn't put your intentions into that.
Upgrading your device will make the biggest difference in my opinion.

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