Pellon is not a woven and it really won't shrink. Wise move to switch to wovens. I've put in a lot of interfacing and have never liked the results from Pellon. I do like their Decor Bond for bags but that is a bit different application and product. I haven't had blistering with that.
What can happen is the fabric can shrink,not necessarily the interfacing so it is important that both are pre treated. As it shrinks up in the wash or with a steam iron, after application, it makes bubbles. I have had poly fabrics visibly shrink in front of my eyes as I tried to put on the interfacing. What I do, before ironing on the fusible, is hold the steam iron, with heavy steam, about an inch off the fabric and just steam the heck out of it to help shrink the fabric up. I let it sit till dry, then fuse on the IF. Because of this tendency you need to cut any fused pattern parts larger. Once the fusible is on, place them over your pattern again and check for fit. Recut for any adjustments. You will almost always have a change in shape or size of the pattern piece once fused. HTHs.