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Ya, bearing spring guide will add an extra 15fps or so, putting you right into your prefered area of velocity.
Last week I got my order of reinforced mechboxes in (among a bunch of other interals) and while I had a few other guns as priority to work on, a bud (Testtube) asked if he could borrow one of my MP5s to use at "The Mill" game (CQB game last weekend) in order to loan his SR-16 to a new local player, because the MP5-A I've used all year was my back up one (shooting 365fps), I decided to rebuild my MP5-SD (which has been in parts for months due to broken mechbox) first. The gun has a 330mm inner barrel, bearing spring guide, and used to shoot 385fps with the PDI 150% spring I had in it. New piston and head went into it (both Deepfire), some new wiring with Deans connectors, and stock spring. End result was 320fps using 0.20g BBs, and that was with the hop up set for 0.25g (no hop up with 0.20g I was getting between 335 and 340fps).
So just adding a bearing spring guide might get you into the area you hope for.
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