I made a patch that changes the size of bullets for an approximate match the size of their actual hitbox (usually real hitboxes two to three times smaller in radius than the visible). The patch greatly enchances the game in motion, because it helps to see clearly on the stages and it no longer becomes neccessary to shy away from the safe edges of bullets. I did an intial test for myself, and with it I beat 4 extras, 2 hards and phantasm.
The patch is available for all windows shmups, including photoshooters and ISC. The patch is made only for the English versions of the game, not for the Japanese, but everyone can make Japanese and other languages versions of the patch (see below). To install the patch, download the archive from
https://drive.google.com/file/d/0BywWLeeGhobmWTd0blkwcGlFamM and replace the .dat file in the game folder. UPD: for DDC and for ISC, there is another way: Place "bullet" folder into the "thcrap\thpatch\lang_[yourlang]\th14(3)" folder. Inside the dat file change only the etama.anm/bullet.anm file, which contains the bullet sprites. These files for all the games are located in the /src folder and can be used to implement a patch to other localizations. For EoSD there are 2 versions of the patch: for standard and graphically enhanced versions. For EoSD and MoF there are versions of the patch for the Russian localization (so EoSD have 4 versions of the patch).
In very rare cases (I know only two examples: Kisume spellcard and first Kanako spellcard) this patch causes the following problem: spellcard is used heavily magnified images of conventional bullets (white and orange), so with the patch, these elements are apparently sized smaller than the true hitbox, so be careful. In addition, due to a Touhou Toolkit bug with handling english dat-file of PoFV, when it is built partly used files from the Japanese version the endings will be in Japanese.
The patch was made using Touhou Toolkit (
http://en.touhouwiki.net/wiki/Game_Tools_and_Modifications#Touhou_Toolkit) and TKTK GUI (
http://www.shrinemaiden.org/forum/index.php/topic,15119.html), thanks to their authors.