as salam alaikum
Shi'a authentic spirituality does not fall under the category of "sufism" as it is widespread nowadays. Shi'a spirituality is based on a deep understanding of the Qur'an and Sunnah and it includes taqwa, zuhd, dhikr and love for Allah in the way practiced by the Imams and their followers. Concepts and practices that have been introduced later on are not part of the spiritual Shi'a legacy.
In other words the purification of the soul according to Quranic teachings and Prophetic Sunnah as transmitted from the Imams is endorsed but no innovations should be introduced in it.
This does not tantamount to deny the possibility of mystical experiences by the believer but rather it confirms it as Allah wills.
With prayers for your success.